0 compression with dohc swap/ I think I have a bigger proble

waldo320 · Post by **waldo320** » Tue May 22, 2007 4:02 am

Then what could it be even if you forgot a head gasket there would still be compression on 2 of 4 cylinders were as I have 0 on all 4. Next a missing intake manifold gaskes or exhaust manifold gasket would not cause this problem. So that would leave a stuck open valve or valves. I got the valve stem seals tested and they came back fine. Thats why timing is hard to over look as the problem. If I am missing something please let me know?

SemperGuard · Post by **SemperGuard** » Tue May 22, 2007 4:07 am

Well then fix the timing.

BAC5.2 · Post by **BAC5.2** » Tue May 22, 2007 10:50 am

Number 1 needs to be in the middle of the stroke, so that all pistons are in the middle of the stroke.

You don't time the dual-cam motors at Top Dead Center.

waldo320 · Post by **waldo320** » Tue May 22, 2007 2:46 pm

So just use a screw driver to find out where the middle of the up stroke or down stroke is? Right now my timing mark as pictured is #1 at the bottom the oposite of tdc. Or is there another mark that I line my crank gear up to?

Matt Monson · Post by **Matt Monson** » Tue May 22, 2007 5:33 pm

Stop taking these half assed pictures that are attempting to be right. Take me a picture of the complete front of the engine. Also, give me the part number that is stamped on the belt. I refuse to get down in the trenches with this pubescent arguing and mental masturbation, but will help you solve your problem if you give me decent information to work with. Garbage in gives you garbage out. I'll check back later and see if you are trying to help yourself...

n2x4 · Post by **n2x4** » Tue May 22, 2007 6:00 pm

Not to hijack or anything but I'll have to come check this project of yours out sometime. I'm just to Akron every day for work.

waldo320 · Post by **waldo320** » Tue May 22, 2007 8:27 pm

Nrx4 I live right of 21 in copley so let me know if you whant to stop by.

Mr. Monson these pictures are the best that I can do with radiator still in enjoy.

555BCTurbo · Post by **555BCTurbo** » Wed May 23, 2007 12:05 am

I had the same problem on a SOHC engine I just built...and it had solid lifters, and it ended up just having all of the lifters too tight...

So check lifters!

waldo320 · Post by **waldo320** » Wed May 23, 2007 12:49 am

I did not know you could adjust the lifters with shim over bucket style? Could the cams be torqued down to much?

BAC5.2 · Post by **BAC5.2** » Wed May 23, 2007 11:25 am

The cams being torqued down too much wouldn't result in zero compression. It would result in a seized cam though.

Does the motor turn over easily by hand (it should be nearly effortless because it's not making any compression.

waldo320 · Post by **waldo320** » Wed May 23, 2007 2:43 pm

No the motor does not turn over to easy it requires a good bit of muscle.

Post by **Legacy777** » Wed May 23, 2007 5:53 pm

How did you test the compression tester?

waldo320 · Post by **waldo320** » Wed May 23, 2007 6:37 pm

Tested it on my friends dsm and it read 150.

Project_Legacy · Post by **Project_Legacy** » Wed May 23, 2007 6:43 pm

did u ever check to see if that 96 cam gear was different? if the 96 and 99 dohc's had different timing belts, the cam gears could be different too.

Splinter · Post by **Splinter** » Wed May 23, 2007 8:16 pm

I was under the impression that all EJ DOHC belts were the same?

Project_Legacy · Post by **Project_Legacy** » Wed May 23, 2007 8:52 pm

hm, im unsure of that. he can at least check to see if those cam gears are similar enough to use though

Matt Monson · Post by **Matt Monson** » Wed May 23, 2007 11:54 pm

Those pictures don't really tell me a whole lot. First thing I would do is get all the timing marks lined up properly and see if that is right or not. There's nothing clear in this thread about you actually doing this properly yet. I suspect that it's still a belt alignment issue. It's not a gear issue. The teeth count on the gears was the same from 89-98. That's not the issue.

Next thing I would do is take off the belt and pop closed the open valves. Then I would test compression on every single cylinder with the belt off and see what the results are. This will tell you if it's maybe valves or head gasket related before you reinstall the timing belt. After that, check back...

Matt Monson · Post by **Matt Monson** » Wed May 23, 2007 11:55 pm

Splinter wrote:I was under the impression that all EJ DOHC belts were the same?

They are not. They changed with the change in design in tensioners in '99...

waldo320 · Post by **waldo320** » Thu May 24, 2007 4:12 am

Pictures to show the timing alignment.

I know for a fact that the belts are diffrent between a 96 dohc and a 99, and also know that the tensioners are diffrent. Next that would mean that do to the diffrent styles of tensioners that all who do the dohc swap using our block would need a pre 99 timing belt?

waldo320 · Post by **waldo320** » Thu May 24, 2007 6:17 pm

I did a compression test and found that compression was 160 on the passinger side, and compression was 0 on driver side cy 2 and 4. So thats were I am at right now leaving one of the cams out of phase?

Matt Monson · Post by **Matt Monson** » Thu May 24, 2007 7:37 pm

SemperGuard wrote:Well then fix the timing.

I think we have reached this point...

waldo320 · Post by **waldo320** » Thu May 24, 2007 8:05 pm

Is there any way I can check to see if the if it is the intake or exhaust cam out of sink? I will not have another chance to work on it till after this weekend so I will let you know what happens. Thanks You All for your help!

Matt Monson · Post by **Matt Monson** » Thu May 24, 2007 8:12 pm

Well,
You only showed us pictures of the timing belt for one pair of gears. We can't see the other side, but they should all line up perfectly. With the DOHC heads, there are 3 marks per gear that need to line up. The one with the marks out of alignment is the one, though none of this really matters at this point. The belt is coming off and needs to be redone.

And just to be sure, check compression on all cylinders while you have the belt off. It could still be a HG issue since one side shows zero compression and we don't have the best pictures, but the side you showed appears to be correct and it is also the side that is showing zero compression.

You really aren't saving yourself any time of effort by leaving the belt on there any longer. If it's not the belt alignment, the heads have to come of the block regardless. So, step away from the keyboard and pick up a wrench...

douglas vincent · Post by **douglas vincent** » Thu May 24, 2007 8:20 pm

Is there any chance that you could have switched the cams (intake for exhaust and vice versa?). Although I think this is only possible on the passenger side head....

NICO · Post by **NICO** » Fri May 25, 2007 12:22 am

^^ douglas vincent you taken the words right out my mouth thats what i did and it sounds like the same problem.

also take that dam aluminum pully out as well and use a stock one.

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0 compression with dohc swap/ I think I have a bigger proble