North American Turbocoupe Organization



Pulled head, not obvious blown head gasket...
lcdearman Offline
Member
#1
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
88 TC - Daily driver, maroon, 5 spd, K&N, pony wheels
81 El Camino - 305/TH350, working on MS TBI/spark conversion
Reply

tr_guy79 Offline
Senior Member
#2
Definitely looks like it was leaking between 1 and 2 on the under side of the gasket. Did you check the head for flatness?
3rd Annual Philly Tri-State NATO Meet - http://natomessageboard.com/ultimatebb.p...p=1#000003

'87 - Range Roller 4* adv / 50 trim t04e / Ported E6 / Gutted Knifed intake / Stinger 3->2.5" / Adj. Cam Pulley / Warlboro 255

To Do: PIMP/MS2, FMIC, Bigger Inj
Reply

Pete D Offline
Administrator
#3
Be sure to check th block for flatness in that area also.
Pete Dunham


Reply

lcdearman Offline
Member
#4
I'm gonna borrow some machinist's flats tomorrow and check it out.
88 TC - Daily driver, maroon, 5 spd, K&N, pony wheels
81 El Camino - 305/TH350, working on MS TBI/spark conversion
Reply

TurboCoupe50 Offline
Posting Freak
#5
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...
1988 Turbo Coupe331 AOD

1972 Comet GT

1969 Fairlane Cobra 428CJ 4-Speed
Reply

lcdearman Offline
Member
#6
That was the block side of the gasket. The head was clean, no signs of anything.
88 TC - Daily driver, maroon, 5 spd, K&N, pony wheels
81 El Camino - 305/TH350, working on MS TBI/spark conversion
Reply

lcdearman Offline
Member
#7
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...
88 TC - Daily driver, maroon, 5 spd, K&N, pony wheels
81 El Camino - 305/TH350, working on MS TBI/spark conversion
Reply

RDOG Offline
Posting Freak
#8
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?
1986 Turbo Coupe. Boport StageIII head, Boport 2.1, Performance Techniques 50 trim hybird, StageII.63, stinger 3" exhaust, Phenolic spacer, Boglog header,NPR FMIC intercooler setup, kirban fpr, bigrmotorsports fuel rail, diablo water meth kit, CAI, remote mount TFI, CHE rear adj control arms, MAC girdle, 8.8 rear disc, aluminum drive shaft, H&R lowerings springs Tbird Turbo Specific, y MAS!!
Reply

lcdearman Offline
Member
#9
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.
88 TC - Daily driver, maroon, 5 spd, K&N, pony wheels
81 El Camino - 305/TH350, working on MS TBI/spark conversion
Reply

lcdearman Offline
Member
#10
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.
88 TC - Daily driver, maroon, 5 spd, K&N, pony wheels
81 El Camino - 305/TH350, working on MS TBI/spark conversion
Reply





Users browsing this thread:
1 Guest(s)



Theme © iAndrew 2018 - Software MyBB