Bent Valves

[Momar]

I just bought a 92 TSI. The car supposedly had a timing tensioner failure, and bent the valves. I have the head that was on it originally. The person I bought it from installed another head and timing belt ect... He was never able to get it running. I did a compression test and found no compression on cyl 1 and cyl 3. the 2 and 4 were around 75. The compression tester I used was messed up though. It would bleed off as soon as you stopped cranking so I dont know if those numbers are accurate.

Anyway, I pulled the head. It looked like a couple of the exhaust valves might not be sitting flat. I tried putting watter in the ports on the exhaust side with the valves closed. Sure enough, 1 and 3 the watter ran right out of the valves. 2 and 4 held water and did not leak with the valves closed. All intake valves sealed.

Now my questions. First, can I assume that if the valves didn't leak water that they will hold compression? Second on cyl 2 and 4 could the valves be the problem and cause low compression, or with a bent valve is it all or nothing. To be honest, I wouldn't be surprised if the head gasket wasn't torqued properly, or surface not cleaned completely or something. Also, like I said the gauge didnt seem to be functioning properly, so they may have read higher if it was. Thoughts?

Thanks
Ben

Anybody?

 

[rw87tt]

Since you know you have two bent valves and the head is off. I would take it to a machine shop and have it checked out. They have a real simple device that tells them what valves are leaking. There might also be valve guides that need to be replaced due to the side loading caused by the valves that are bent.

 

[JM90gst]

Since you know you have two bent valves and the head is off. I would take it to a machine shop and have it checked out. They have a real simple device that tells them what valves are leaking. There might also be valve guides that need to be replaced due to the side loading caused by the valves that are bent.

I agree. The best way to know what is going on is to just take it to a machine shop. They can pretty much tell you what's wrong.

 

[Momar]

Any idea what it will cost to have inspected. I don't want to spend too much on this head. I can get a remanned head for around 265. If I can save money going this rout I will but I don't want to spend more to fix this head than it would to get another.

 

[khartley]

If you really want to be cheap, disassemble the head and take only the valves to them, and have them clean them up and check them. Then just replace the ones that were bent. Machine shop won't charge more than $20 for 16 valves, at least mine doesn't.

 

[Momar]

Well I don't want to completely cheep out, but I am on a budget so I do want to choose the most effeciet route possible. I was just wanting to get an idea of what to expect so I can compare my options.

 

[JM90gst]

Best bet is to just call and get a quote from your local machine shop and if its going to be too much just get a remand one.