North American Turbocoupe Organization

Full Version: Pulled head, not obvious blown head gasket...
You're currently viewing a stripped down version of our content. View the full version with proper formatting.
Pages: 1 2
The compression was:

#1 - 80
#2 - 80
#3 - 120
#4 - 120

Here are some pictures:
#1 cylinder to the left, #2 centered. Note dark area between them.
http://natomessageboard.com/uploads/0000...lock_1.JPG

Here is a picture of the head gasket between #1 and #2. Note dark stripe towards bottom.
http://natomessageboard.com/uploads/0000...sket_1.JPG

There is a lot of carbon on #1 piston, the others look fine. The valves are all whitish grey. Maybe running lean?

Did I just catch this very early in the gasket blowing process? The engine was a little down on power and Friday the idle was a little rough after warmup. With 25 psi air going into #1 I could hear a little air in #2 but it wasn't horrible...

Thanks,
Clay
Definitely looks like it was leaking between 1 and 2 on the under side of the gasket. Did you check the head for flatness?
Be sure to check th block for flatness in that area also.
I'm gonna borrow some machinist's flats tomorrow and check it out.
The gasket wasn't leaking on the side pictured, was that the head or block side??? There apparently is evidence of leakage on the block surface...
That was the block side of the gasket. The head was clean, no signs of anything.
Well, the deck and head check out so I am just going to reassemble it with a new gasket and head bolts. It should be just fine...
Did you pull the valves out of head, to see if there is a crack between the seats? Since you have the head off, I would go ahead and change the seals for increased assurance? Plus those pistons look like seals are going bad too. Lots of black caked up carbon. Was the car smoking?
I have not pulled the valves. This engine does not smoke either. #1 cylinder had carbon, the rest look pretty good to me for 211,000 miles. I have had smoking engines before and the plugs always showed signs. The plug for #1 was actually too white, the rest looked good. No signs of oil or carbon. That was why I did the compression test in the first place. The carbon really wasn't much and wasn't wet or caked like I have seen in oil burning engines in the past. It came off very easily.

The only issues I had were the car started running a little rough at idle on my way home from work on a Friday, Saturday I did the compression and "leakdown" test and found #1 and #2 low on compression and air from #1 was coming out the #2 spark plug hole.
RDOG, I see you are in Fontana. Are you a mechanic and did you have a TC up for sale a little while back, a maroon one? I ask because my son lives out in LA and met somebody at union station (I think that was where it was) to look at an '88 TC. I think it was at the end of last year.
Pages: 1 2