How to time the 4ze1 2.6 4 cylinder engine.

Here are all of the best threads. Alert an admin to nominate a thread

Moderator: Staff

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bradzuzu » Fri Jul 13, 2012 11:55 pm

Those two items are my best friends at work... Bart engine mechanical timming and engine ignition timming are two different things.. They coincide with one another and the ign sets off of the engine being in time yes.. But because of the four stroke principal you have to know or make sure your going off of the givin cylinder that's on it's compression stroke..
Like on chev small blocks , people get the dist. off 180 frequently.. Reason is you set the cam and crank facing dot to dot on the gears.. If you don't spin it so the cam dot is up ,well then it's 180 deg off..
User avatar
bradzuzu
Donor
Donor
 
Posts: 13282
Joined: Mon May 30, 2011 5:09 pm
Location: Vancouver, Washington
Has thanked: 188 times
Have thanks: 356 times

Sponsor
 

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby T89 » Sun Jul 15, 2012 1:28 am

I tried setting the timing belt and taking the slack out of the right side by turning the motor over counter clockwise. However, when taking the slack out, I end up with my cam marks lined up and then the crank sprocket off 1 tooth.

Tomorrow I shall try setting the cam mark, then setting the crank mark off one tooth. Hopefully, when I draw the slack out everything will line up.
User avatar
T89
Mud King
 
Posts: 429
Joined: Thu Mar 17, 2011 9:42 pm
Location: Goodyear, AZ
Has thanked: 8 times
Have thanks: 27 times

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bradzuzu » Sun Jul 15, 2012 1:47 am

It's kind of a Pain keeping the belt tight when installing it so you get the timing right for sure, sometimes you have to move the cam sprocket ever so slightly to get the right tooth combo then turn it back, then take out the slack and set the tensioner tension.. I like to (rock )turn the motor back and forth a few times then come up to the marks to make sure all is well..
User avatar
bradzuzu
Donor
Donor
 
Posts: 13282
Joined: Mon May 30, 2011 5:09 pm
Location: Vancouver, Washington
Has thanked: 188 times
Have thanks: 356 times

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby T89 » Sun Jul 15, 2012 4:28 pm

I tried it again today. The mark is still off. I took the slack out of the left side and but when it's all said and done the crank marks line up but the cam mark is about half a tooth off.

I think when I set the timing on the stand, the tensioner bolt wasn't released. So I was able to line up the lower mark and then move the upper mark with a wrench on the cam gear to move it counter clockwise a half tooth, lining up the cam mark. But this was moving some slack off the tensioner side and moving it to the left side. Once the tensioner is unsprung though, it pulls the cam gear slightly, taking the slack out of the left side and moving the cam mark half a tooth off.

I know if isn't a matter of it being off a whole tooth. If I was, it would still be off half a tooth but in the other direction.

I am thinking there is plenty of adjustment in the distributor to be able to set the appropriate ignition timing.
User avatar
T89
Mud King
 
Posts: 429
Joined: Thu Mar 17, 2011 9:42 pm
Location: Goodyear, AZ
Has thanked: 8 times
Have thanks: 27 times

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby itsmehb » Wed Sep 19, 2012 8:32 am

Thanks Squatch, this is the best I've seen on the topic. My next step is to remove the cam (I dont want to bend any valves), then remove the lower timing cover and follow your footsteps....Harry
User avatar
itsmehb
Almost Joe Isuzu
 
Posts: 2880
Joined: Fri Jan 14, 2011 9:39 am
Location: Lewisville Tx.
Has thanked: 100 times
Have thanks: 184 times

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bradzuzu » Wed Sep 19, 2012 1:53 pm

Side note..
When you get the head or block surfaced it brings the pullys closer together.. I've seen in several occasions where the cam will be off by half the tooth.. It's nothing to worry about and generally the belt will stretch a bit and retard the cam timing anyway.. Chain drivin cams do the same thing as well.. If you try to jump the tooth advanced it pulls to far.. Other side note a slightly retarded cam will give more bottom end, it works out to about 2-3 deg ,which can be adjust with the distributor timing ...
User avatar
bradzuzu
Donor
Donor
 
Posts: 13282
Joined: Mon May 30, 2011 5:09 pm
Location: Vancouver, Washington
Has thanked: 188 times
Have thanks: 356 times

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bragado » Wed Dec 12, 2012 1:39 pm

some questions :
next saturday will work with my engine again , 1000 miles rebuilder for me ,new cylinder head , piston rings , crankshaft bearings , oil and water pump . this is the time for adjust cyilnder head bolts and valves
. the engine knock ( pistons ) with 93 octane gas , when use 98 octane is much better , but I see 1 point delayed in camshaft gear , verify urgent !! temperature is Ok without problem
the engine start in 1/ 2 second is very good !! but I need work in timming belt and distributor . ( nippondenso )

stupid question !!! , because in my country all engines have a cylinder 1 near to radiator and cyilinder 4 Gear box side ( ford - chevy . etc etc old series ) in 4zd1 is the same ???
fuel consumption in city 1 liter each 10 km . last trip with my caravan behind 20 liter each 100 km - bad bad bad ! is a 4zd1 no is a HEMI 7 LITER !!!
lisen to answers
excuseme for my bad english .
regards from argentinas pampa
bragado
Drives on Pavement
 
Posts: 9
Joined: Thu Oct 11, 2012 3:59 pm
Has thanked: 0 time
Have thanks: 0 time

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bradzuzu » Wed Dec 12, 2012 5:15 pm

It sounds like your engine is pinging really bad, that can ruin the pistons very quickly !! # 1 is up front like usual.. What is your ignition timing set at ?? The cam timing may or may not be off but if it is you need to correct that first and foremost ...
Did you ever verify dots on the crank itself to the cam dot ?? The pullys / balancer likes to slip/turn and it will throw off your initial engine crank/cam timing ... Squatch has plenty of pictures showing all of this so take your time and look through so you will have a good understanding of what you need to Look for...
User avatar
bradzuzu
Donor
Donor
 
Posts: 13282
Joined: Mon May 30, 2011 5:09 pm
Location: Vancouver, Washington
Has thanked: 188 times
Have thanks: 356 times

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bragado » Thu Dec 13, 2012 12:17 pm

[quote="bradzuzu"]It sounds like your engine is pinging really bad, that can ruin the pistons very quickly !! # 1 is up front like usual.. What is your ignition timing set at ?? The cam timing may or may not be off but if it is you need to correct that first and foremost ...
Did you ever verify dots on the crank itself to the cam dot ?? The pullys / balancer likes to slip/turn and it will throw off your initial engine crank/cam timing ... Squatch has plenty of pictures showing all of this so take your time and look through so you will have a good understanding of what you need to Look for...[/quote]

ok thanks for your help
ignition timming 6 degrees to 800 RPM . next friday night ( the summer this year is very hot here ) will work in all itmes . and will send pictures with my work -
the distributor is the target , also timming belt too , i think to buy spare parts in Us , ( especially ignition parts ) are difficult to buy in my country now

best regards
bragado
Drives on Pavement
 
Posts: 9
Joined: Thu Oct 11, 2012 3:59 pm
Has thanked: 0 time
Have thanks: 0 time

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bragado » Thu Dec 13, 2012 7:09 pm

well , in this moment I verify vacuum advance , 800 RPM 6 degrees ok , when the engine go to 1200 rpm , the same 6 degrees wihout changes , when the engine go 1455 RPM advance 12 degrees , when the engine go to 1600 RPM THE ADVANCE GO TO OUT OF SCALE 12 degrees more !! is WRONG -
Maybe my engine a new vacuum advance but in my country is not avilable , colud you pls to help , where buy this part in USA -
this is my treasure , attach picture my first trip
You do not have the required permissions to view the files attached to this post.
bragado
Drives on Pavement
 
Posts: 9
Joined: Thu Oct 11, 2012 3:59 pm
Has thanked: 0 time
Have thanks: 0 time

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bradzuzu » Thu Dec 13, 2012 7:18 pm

What year is that truck ?? Does it for sure have a vacuum advance ??
User avatar
bradzuzu
Donor
Donor
 
Posts: 13282
Joined: Mon May 30, 2011 5:09 pm
Location: Vancouver, Washington
Has thanked: 188 times
Have thanks: 356 times

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bragado » Sat Dec 15, 2012 11:26 am

this is a 95 . carburated ( nikki ) , without air pump system , type federal US , in this moment attach pictures with timming belt . 1/2 point delayed to signal timing belt camshaft . the cranckshat pulley is compact in 1 piece ,I remember when put the white mark in line with the mark of oil seal support . could you pls help me , 1/2 point is really bad ??
You do not have the required permissions to view the files attached to this post.
bragado
Drives on Pavement
 
Posts: 9
Joined: Thu Oct 11, 2012 3:59 pm
Has thanked: 0 time
Have thanks: 0 time

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bragado » Sat Dec 15, 2012 11:58 am

[quote="bragado"]this is a 95 . carburated ( nikki ) , without air pump system , type federal US , in this moment attach pictures with timming belt . 1/2 point delayed to signal timing belt camshaft . the cranckshat pulley is compact in 1 piece ,I remember when put the white mark in line with the mark of oil seal support . could you pls help me , 1/2 point is really bad ??[/quote]
You do not have the required permissions to view the files attached to this post.
bragado
Drives on Pavement
 
Posts: 9
Joined: Thu Oct 11, 2012 3:59 pm
Has thanked: 0 time
Have thanks: 0 time

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bradzuzu » Sat Dec 15, 2012 12:15 pm

You should probly move this to a post in drivetrain problems dude, you'll get more input.. You should probly remove the lower cover and match up all the timing points, I'm guessing the ballencer has slipped ...
User avatar
bradzuzu
Donor
Donor
 
Posts: 13282
Joined: Mon May 30, 2011 5:09 pm
Location: Vancouver, Washington
Has thanked: 188 times
Have thanks: 356 times

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bragado » Sat Dec 15, 2012 4:31 pm

[quote="bradzuzu"]You should probly move this to a post in drivetrain problems dude, you'll get more input.. You should probly remove the lower cover and match up all the timing points, I'm guessing the ballencer has slipped ...[/quote]
ok in this moment the cranckshaft bolt was fix with loctite , I need to a pNeumatic tool . I m in problems ... will work in that
thanks you !!
bragado
Drives on Pavement
 
Posts: 9
Joined: Thu Oct 11, 2012 3:59 pm
Has thanked: 0 time
Have thanks: 0 time

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bragado » Sat Dec 15, 2012 6:27 pm

well , disasembled , all parts and aseembled again , all ok , when I see the pictures of squach , your matchmark plate side cammshaft is in the same place of my gear is .
is possible , the jappanese man was drunk when assemble my engine -
thans a lot , and now I m going to fininsh my truck .
bragado
Drives on Pavement
 
Posts: 9
Joined: Thu Oct 11, 2012 3:59 pm
Has thanked: 0 time
Have thanks: 0 time

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bradzuzu » Sat Dec 15, 2012 8:52 pm

Where you off a tooth then ??
User avatar
bradzuzu
Donor
Donor
 
Posts: 13282
Joined: Mon May 30, 2011 5:09 pm
Location: Vancouver, Washington
Has thanked: 188 times
Have thanks: 356 times

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby PhilD » Thu Nov 07, 2013 10:52 pm

IsuzuGeek wrote:
Selador wrote:When the #1 cylinder is at the top of it's travel, so is the #4 cylinder.

But only one of them is ready to fire.


Bart


Both are at TDC, but one's at the top of its compression stroke, and the other's at the top of its exhaust stroke.

Piston #4 is at TDC at the top of its compression stroke, and at the top of its exhaust stroke, but how do you know which is which, when it comes to timing? YOU don’t, but the camshaft does: when the timing marks are lined up, THAT’S TDC of #4’s compression stroke (which also happens to be TDC of piston #1's exhaust stroke). That’s just the way Isuzu designed it. Why they did it that way when most other vehicles use cylinder #1 as a reference, who knows: maybe it facilitated assembly line speed. You COULD take it upon yourself to modify the markings such that they correspond to the position of the piston in cylinder #1, but why bother, now that you know the 4ZE1 bases them on cylinder #4?
PhilD
Drives in Mud
 
Posts: 91
Joined: Mon Jun 11, 2012 9:38 am
Has thanked: 2 times
Have thanks: 1 time

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby PhilD » Tue Jul 29, 2014 8:16 pm

Regarding TDC: yes: pistons #1 and #4 are simultaneously at TDC when the crank and cam timing marks are lined up: the difference is that #4 is at TDC of the compression stroke, whereas #1 is at TDC of the exhaust stroke. Rotate the crank 360 degrees, and the opposite becomes true.

A point of confusion that's hard to get past is that Isuzu, for no compelling reason I've yet read, decided to base the ignition timing of the 4ZE1 engine on cylinder #4 (despite the fact that most every other engine ever built bases ignition timing on cylinder #1). In other words, when the crankshaft and camshaft are simultaneously lined up with their respective timing marks, it’s the #4 spark plug that’s firing. Consequently, you attach the inductor of your timing light to cylinder #4’s spark plug wire when fine-tuning the ignition timing.
Last edited by PhilD on Tue Dec 08, 2015 5:51 pm, edited 2 times in total.
PhilD
Drives in Mud
 
Posts: 91
Joined: Mon Jun 11, 2012 9:38 am
Has thanked: 2 times
Have thanks: 1 time

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby PhilD » Tue Jul 29, 2014 10:53 pm

squatch: is it possible to move the outer ring into its correct position, and if so, would it make sense to maybe spot weld it to the "hub?" Any idea why it's not a single piece in the first place?
PhilD
Drives in Mud
 
Posts: 91
Joined: Mon Jun 11, 2012 9:38 am
Has thanked: 2 times
Have thanks: 1 time

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bradzuzu » Tue Jul 29, 2014 11:47 pm

It has a rubber insulator to take the harmonics and balance out the crankshaft , very needful thing on most engines...
91 amigo sas toy front leaf- traded off :(
2000 amigo sas d44 wagonear 4 link
custom built buggy ffor the dirty stuff

My build up page
Four link pics
Intake R&R - port and polish

Sometimes trying is all you can do, but when you succeed , that's something to be proud of...
User avatar
bradzuzu
Donor
Donor
 
Posts: 13282
Joined: Mon May 30, 2011 5:09 pm
Location: Vancouver, Washington
Has thanked: 188 times
Have thanks: 356 times

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby PhilD » Tue Mar 31, 2015 11:31 pm

Squatch: thanks for the great post! Is there a particular alignment the mark on the harmonic balancer is supposed to have relative to the keyway, or something like that?
PhilD
Drives in Mud
 
Posts: 91
Joined: Mon Jun 11, 2012 9:38 am
Has thanked: 2 times
Have thanks: 1 time

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby squatch » Thu Apr 02, 2015 11:27 pm

PhilD wrote:Squatch: thanks for the great post! Is there a particular alignment the mark on the harmonic balancer is supposed to have relative to the keyway, or something like that?


I'm sure there is but I have no idea what the measurement is. Just line the timing pulleys up and put the cover on. If it doesn't line up with the TDC on the cover it's off some.
These links have write-ups and pics of most anything you ever will do on a 2.6 Isuzu. Engine, brakes, suspension, interior, you name it! Enjoy!
Original '88 Trooper frame off build.
viewtopic.php?t=12172
The continuing Trooper project.
viewtopic.php?f=15&t=43909
My '88 Spacecab build. In progress.
viewtopic.php?f=15&t=56442
User avatar
squatch
I am the Stig
 
Posts: 10236
Joined: Sat Dec 16, 2006 10:48 pm
Location: Maryland
Has thanked: 66 times
Have thanks: 319 times

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby tdr264 » Thu Oct 29, 2015 10:22 am

I am having a little trouble getting my 4ze1 to run smoothly. I did nothing to the timing except pull and replace dist. with #1 @ tdc w/dist. in line to fire @ #1 runs and adjusts but something seems very wrong. Could it be M.A.P. or M.A.S.
tdr264
Drives on Pavement
 
Posts: 7
Joined: Wed Sep 23, 2015 11:25 am
Has thanked: 5 times
Have thanks: 0 time

Re: How to time the 4ze1 2.6 4 cylinder engine.

Postby bradzuzu » Fri Oct 30, 2015 2:14 pm

It might be that the dizy is 180* off , might recheck that first ..
91 amigo sas toy front leaf- traded off :(
2000 amigo sas d44 wagonear 4 link
custom built buggy ffor the dirty stuff

My build up page
Four link pics
Intake R&R - port and polish

Sometimes trying is all you can do, but when you succeed , that's something to be proud of...
User avatar
bradzuzu
Donor
Donor
 
Posts: 13282
Joined: Mon May 30, 2011 5:09 pm
Location: Vancouver, Washington
Has thanked: 188 times
Have thanks: 356 times

PreviousNext

Return to Hall of Fame

Who is online

Users browsing this forum: No registered users and 2 guests