Timing Belt Problem

[Chris@Rvengeperformance]

When you do the leak down test are you hearing the air coming from the intake or exhaust? Definitely sounds like the cams are putting pressure on a valve. You might not be exactly on TDC or the cam gears are causing one to open a tad. Try and wiggle the cam gears during the test.

I think I would run it then test it again after some break in.

The air is rushing out both sets of ports. I tried moving things around a bit as I was testing and same results. I would run it and see what it does, but I don't see how it can run leaking this bad.

[green-lantern]

So this only happens on one cylinder and only with the timing belt on? If so you might want to swap lifters around if you haven't already. Make sure you didn't mix the cams up or the cam gears. It's weird you lose air out the intake and exhaust though.

[Chris@Rvengeperformance]

no its every cylinder. I remove the rockers and leak down is great. As soon as the rockers are installed the valves are clearly leaking a ton. The cams are correct and the gears are timing right.

[Chris@Rvengeperformance]

hey does anyone have a pic of the camshaft lobes with the pistons at TDC?

I think I'm going to set the gears in the stock position and see if it changes anything. This has almost got to be a timing issue somehow.

[Chris@Rvengeperformance]

ok, it is pretty early to tell, but I took 2 lifters out and really pumped all the oil out of them and now it holds leakdown. I guess it was just lifters pumped up too much. Maybe it would've straighted out if I tried running it, but I feel a lot better about it now. Thanks for the suggestions. If anyone wants my advice, don't pump up your lifters, just soak them. That's what I'd always done before, but so many people said to pump them up that I did this time to try to do it the right way, lol.

So, now I have to retimed it for the 20th time and redo all the lifters, rockers. Nothing good is easy

[wingnut]

Congrats, I was just about to subscribe for the solution...

...then again, I have never done anything but soak mine either

[JasonY]

Glad you found the problem! I've always just soaked the lifters myself...

Jason

[Chris@Rvengeperformance]

Glad you found the problem! I've always just soaked the lifters myself...

Jason

yeah I wish I would've went with what has worked for me in the past. I'd have this thing timed and the turbos on by now. Oh well, at least the valves aren't bent.

I got one head ready to go before I went to bed last night and all three cylinders hold leakdown just fine.

[Chris@Rvengeperformance]

well, good news. Engine is timed, tension is good, marks are lined up, and I have good leak down on all six. Now I can move on finally.

[mb3000]

Good luck with the rest of the build Forest!