valve marks in pistons ADVICE NEEDED PLEASE READ

[hustonr123]

put motor on tdc  timing is rite on   what's next

[Mark(The Miser)UK]

put motor on tdc  timing is rite on   what's next

What if your TDC mark on the flywheel was out? If so, that would explain the hits.

Do the TDC location trick with a valve deliberately dropped, so as to find true TDC.

[westcoaster]

Wasn't there something about a gasser flywheel on the diesel engine causing timing issues? (wrong timing marks)

Thought I saw a thread on that....

[hustonr123]

I swapped lifters from the gasser motor that was in my car. They made most of the noise go away. It still was missing cracked injector lines loose still number 3 cyl. rechecked compression this is what i came up with 1 415  2 410 3  120 4 420.  I ran it a few miles was a really smokey start then  ran great under boost. still just as powerfull.  When i made it back home motor wasnt missing to bad. still noticable.  you guys think a have a valve alittle tweaked from the bad lifters?   Should I run it more see if it will work itself out?  I dont think I have a ring problem, if all the loss compression was going past the piston wouldnt it be blowing oil everywhere? Guess I could be wrong. prior to my problem motor only used a qt every 1500 miles.  Is there anyway to tell if there is a bad valve without ripping the head back off.

[truckinwagen]

you could do a leakdown test, that would tell you where you are losing compression.

probably a bent valve not seating properly.

[Vincent Waldon]

120 psi is likely not going to work itself out...  a leakdown test is a good diagnostic but my guess is that the head is coming off sooner or later. 

[hustonr123]

put 75 miles on car today ran pretty good hasnt really missed to much  maybe the lifters from the gas motor needed to get adjusted to the differnt valves

[Runt]

Wasn't there something about a gasser flywheel on the diesel engine causing timing issues? (wrong timing marks)

Thought I saw a thread on that....

I think westcoaster just nailed it.  I forgot/missed where you said it was a gasser conversion.  The timing marks on the flywheel are NOT the same.  If you used the gasser flywheel, your timing mark is offset, possibly by about 3-5 degrees, according to http://www.vwdieselparts.com/forum/viewtopic.php?p=38396&sid=78ce26069d327d0fe4c02b0b7a67bc38.
Do the valve test to verify TDC, and make a new mark.

[Mark(The Miser)UK]

Wasn't there something about a gasser flywheel on the diesel engine causing timing issues? (wrong timing marks)

Thought I saw a thread on that....

I think westcoaster just nailed it.  I forgot/missed where you said it was a gasser conversion.  The timing marks on the flywheel are NOT the same.  If you used the gasser flywheel, your timing mark is offset, possibly by about 3-5 degrees, according to http://www.vwdieselparts.com/forum/viewtopic.php?p=38396&sid=78ce26069d327d0fe4c02b0b7a67bc38.
Do the valve test to verify TDC, and make a new mark.

Kinda like what I suggested, except there is a TDC mark on a genuine gasser flywheel, in the form of an '0', but the 'l' is at 3 or 6 degrees.
However, setting the cam to the gasser ignition mark would create piston/valve clash from the beginning, or can we just squeeze in 3 degrees?
Skimming head would of course tighten the limits.
How much does a timing belt stretch; creating a delay to the clash?

[hustonr123]

so should i move the flywheel mark couple degrees and see if the noise goes away

[theman53]

No.
You should find top dead center, mark it, and time it to that. You may need another valve in your trouble cylinder.

[arb]

it is possible that the lifters were bad, and pumping too far up, keeping the valves from closing all the way and mashing into the piston.

that being said, it would run like a bag of rabid weasels if the valves were hanging open, long before the valves actually contacted the pistons.

I would recommend a head rebuild and new lifters at the very least.

-Owen

I was first thinking it was still a timing issue, but if you used a dial indicator to check TDC of the piston with the flywheel mark, then I'm with Owen in the rebuild the head camp. Part of the rebuild would be to test each valve spring for actual compression force as well as cleaning & inspection of the lifters, at least that's how I was taught.

This was the 4th post to this long thread.... I don't see where it was ever answered by hustonr123.  Rather hard to help when we are only getting part of the picture.

Did you use a dial indicator on the #1 pistion to verify the TDC mark you were timing to ?