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

[waldo320]

Still working on this stupid dohc swap. The car will not start at all it just sounds like it is farting. So my friend came over today and we did a compression test 0 on all 4 cylinder, and yes we tested the compression tester and it works fine. So if I have 0 compression that would tell me that timing is off. But I have double check and triple checked the line on the cas lines up to the line on the crank pulley, and both cam pulleys are have the single line on top ,and the double lines togher all at tdc(I think its tdc).Next is a fuel issue I can not hold fuel pressure I think that one of my incjectors are stuck open casue I hit 100psi of fuel with an ebay fpr. So need to figure my fuel pressure is not holding? I need some help I am getting really frustrated and thinking about selling it for a 4g please dont make me do this.

[Matt Monson]

Did you align the belt with the triangle or the hash mark on the cam gear?

[waldo320]

Hash mark, once you rotate the belt once or twice do the lines match up with the gears again, cause my sure do not.

[gto7419]

Lines should match up every two rotations of the crank pully...

edit - this does absolutely not work - wow - tried this yesterday after installing my own belt...

[waldo320]

If they do not wrong size belt? Next do you get the belt acording to the head year that you are using or the cam gear year you are using. Cause right now I am using 98-99rs dohc cam gears with 1 95-96 dohc cam gear. While using a 99 rs timing belt?

[SemperGuard]

First of all, that's impossible. You can't use a SOHC belt on a DOHC engine. Secondly, are you talking about the marks on the belt lining up again with the gears? Because they don't do that every rotation. The marks on the belt are just for lining it up the first time. I remember a guy telling me that on porsche engines it was like every 40 rotations or something, the marks on the belt would line up again, I can't remember the exact number but it's not important, it's the same deal

As far as 0 compression, are you 100% sure everything is installed properly, double check eveyrthing..

[Project_Legacy]

check the timing belt for sure. i had same problem with a head swap, timing belt was off. although mine was SOHC. It made the same noise yours was.

also, where u get a 95-96 DOHC cam gear from?? JDM?

[waldo320]

First those dohc cam gears are a hard find ebay, on here, or rs25.com are your best bet. Ok in 96 the outback had a dohc so I am using one of those and 3 99rs cam gears. Next I work at a local parts shop and their is a diffrence between a 99rs timing belt, and a 96 outback timing belt. I am using the 99rs timing belt. Next I am also using the 96 outback crank gear which is identical to my 94 Bc. I have had 4 people now double check my timing and it is dead on I will try to post some pics tonight of my timing marks.

[SemperGuard]

That's not right because 99RS were SOHC.

[waldo320]

The 2.5 lt were dohc, and seriously how can you fit a sohc timing belt on a dohc?

[SemperGuard]

Well somehow you did, or the belt isn't from a 99 RS, which it isn't.

[BAC5.2]

That's not right because 99RS were SOHC.

It was a mid year change. The early 99's were DOHC. A friend of mine had a 99RS with a dual-cam motor.

A single cam timing belt wouldn't fit on a dual cam motor. Simple as that. It's not long enough, and Waldo isn't an idiot. Clearly he's got the right belt.

Is your 96 cam gear identical to the others (in terms of dimensions and tooth count)? If it's slightly smaller or something, then that cam is going out of time every rotation.

Also, are you using an OEM timing belt? I've heard problems of marks being off on non-oem belts.

If the timing is right all over, then it's an assembly problem. Bad valve seals, or a broken/bent valve. It could be that the heads aren't torqued properly. It could be a hole in a piston, or a loose injector. Lots of things.

The biggest thing that throws me, is that you say you THINK it's TDC, which is a problem. Dual cam motors aren't timed at top dead center, are they? Aren't they timed with the motor mid-stroke? I seem to recall Subaru specifying that the DOHC motors be timed mid stroke just in case one of the cams spins, it won't whack the piston. You might want to triple check that you are timing the motor with the crank in the correct position. If you ARE timing it at TDC, then you are timed 90 degrees off, and that would cause zero compression and a failure to start.

Give that a look first thing.

[SemperGuard]

Didn't like all that tranny talk eh? That's okay, I don't care.

[waldo320]

I just did the head swap the car has not run for more than a minute. So I doubt their is whole in the piston, next when I got the head checked they they pressure tested it and everything checked out just fine. I will double check the cam gears, and I also got the timing belt from autozone does anyone know the teath count for dohc timing belt.





Here is a picture of my crank gear and what I believe to be tdc, don't look at the line cause this is after a couple rotations. Let me know what you think?

[SemperGuard]

That's not top dead center, but that doesn't matter, because you don't set the belt with the engine at top dead center. The pisons are in the middle of the stroke when you set the belt.

If everything is lining up, then it's not the timing. If you've had multiple people check it, then it's not the timing. My guess would be that timing is not the problem.

Did you double check everything? Are there spark plugs? Did you put new gaskets everywhere? Rings, etc? Is the wiring of the sensors good? Fuses? Double check EVERYTHING, it's not hard to forget one small thing.

Go check the service manual and do the diagnostics it lists for a no start problem. Otherwise you'll just be guessing until you hit the right thing.

[thehookeup]

can you take a pic of the whole front of the engine with the belt installed?

[BAC5.2]

Didn't like all that tranny talk eh? That's okay, I don't care.

And it doesn't bother me that you have no idea what your talking about.

Waldo, as I said, triple check that your crank is in the correct position to time the motor. If it's really at TDC for #1, then you are 90 degrees off.

If everything else is assembled correctly, the timing is off because of your starting point.

If you timed it correctly, then it's got to be something else. Go over everything with a fine tooth comb.

I bet it's just that you are timing it from the wrong crank position.

[waldo320]

[waldo320]

I just did the tdc test by sticking a screw driver in cy#1, when I got to the timing slash piston #1 was the bottom of the stroke? Is that right?

[douglas vincent]

STupid question, but have you got the belt going the right direction? I have installed it backwards (once).

[gto7419]

Hey Doug, what ever happened to those "how to" videos you made? Wasnt there a timing belt one? Care to share it???

[SemperGuard]

Didn't like all that tranny talk eh? That's okay, I don't care.

And it doesn't bother me that you have no idea what your talking about.

You know I love you.

[gto7419]

Didn't like all that tranny talk eh? That's okay, I don't care.

And it doesn't bother me that you have no idea what your talking about.

You know I love you.

Can everyone else feel the love in this thread?

[waldo320]

This is going the right way right?

[SemperGuard]

THE TIMING IS NOT THE PROBLEM!

If you're bent on just stabbing at the problem, do a leakdown test.