Can NOT get this head to seal..!
#708849
05/26/10 09:53 PM
05/26/10 09:53 PM
|
Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
|
Having a hell of a time with my brother's 94 dodge colt 1.5L. He snapped the timing belt and bent all 4 exhaust valves. So I put new exhaust valves and tested all valves by filling the ports with liquid. All checked out good after I was done. Bought a new head gasket, cam seal and timing belt, got it all back together and tried to start it. Seemed like it was running funny, pulled out the compression tester, two cylinders on the passenger side put out 30psi each, the other two where they were supposed to be at 150. Checked and rechecked the valve lash and cam timing, all good there. Pulled the head back off, cleaned everything thoroughly, chased the threads in the block to clean them up and did the same to the threads on the head bolts. Gave the head gasket (the new one I just took off) a good layer of copper coat on both sides, made sure everything was super clean and and put it back together. Same readings on all 4 pistons again. 30-30-150-150.
I can try another new head gasket, maybe trim down the head locating dowels in case they're too long for the new gasket. Could check the head and block for straightness although I don't see how that could be a problem, I followed the fsm recommendations for removal/install pattern. Is there anything else I'm missing that it could possibly be?
|
|
|
Re: Can NOT get this head to seal..!
[Re: earlybee]
#708851
05/26/10 10:12 PM
05/26/10 10:12 PM
|
Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
|
Quote:
Some head bolts are torque-to-yield. One use only.
I have considered that, however I mixed the head bolts all up when I put it together for the second time and the same result, same two cylinders show diddly..? Plus I can't find anyone who even sells replacement head bolts for this thing.
|
|
|
Re: Can NOT get this head to seal..!
[Re: 4spdfury]
#708854
05/27/10 09:25 AM
05/27/10 09:25 AM
|
Joined: Apr 2004
Posts: 589 Waynesboro, PA
cuda_tim
mopar
|
mopar
Joined: Apr 2004
Posts: 589
Waynesboro, PA
|
Two things... 1) Obviously, you need new head bolts. Not sure if this is the case, but with other Chrysler heads, you torque them to a specific value, then turn them an extra 90 degrees. This definitely stretches the bolts... 2) If the head is aluminum, it could be warped or cracked. I blew a head gasket on my K-Car and took the head to a shop "just to have it checked", and it ended up being cracked... Just my
"Robots building robots.... now that's just stupid!" - Will Smith in the movie "I, Robot".
'71 Demon (340/727)/'69 Charger (383/727)/'65 Barracuda (273-2V/904)/'66 Coronet (340/727)/'86 Dodge Aries (2.5L)/'78 Dodge Aspen (318-2V/904)
|
|
|
Re: Can NOT get this head to seal..!
[Re: DaytonaTurbo]
#708857
05/27/10 10:00 PM
05/27/10 10:00 PM
|
Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
|
I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
|
Check the hydraulic lash adjusters on it... If you whacked the valves you mayhave compressed and stuck the ajdusters.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
|
|
|
Re: Can NOT get this head to seal..!
[Re: moper]
#708859
05/28/10 12:20 AM
05/28/10 12:20 AM
|
Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
|
Quote:
Check the hydraulic lash adjusters on it... If you whacked the valves you mayhave compressed and stuck the ajdusters.
No hydraulic on this thing, all 12 rocker arms are mechanical and I checked and rechecked the valve lash on each one.
If it had anything to do with the valve job, wouldn't it have been obvious when I poured a little bit of gas into each port? Basically none leaked past any of the 4 exhaust valves or 8 intake valves. I checked this on the bench before I first installed it and again after I pulled it.
|
|
|
Re: Can NOT get this head to seal..!
[Re: RodStRace]
#708864
05/28/10 01:56 PM
05/28/10 01:56 PM
|
Joined: Dec 2007
Posts: 7,759 So Cal
HealthServices
Why would you even post that?
|
Why would you even post that?
Joined: Dec 2007
Posts: 7,759
So Cal
|
You bent valves, are the valve guides ok?
Did you check?
Maybe once the rocker arms opens the valve and closes it, the valve is no longer seating correctly.
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
|
|
|
Re: Can NOT get this head to seal..!
[Re: DaytonaTurbo]
#708866
05/28/10 06:29 PM
05/28/10 06:29 PM
|
Joined: Aug 2007
Posts: 606 Mass
charge70
mopar
|
mopar
Joined: Aug 2007
Posts: 606
Mass
|
Can you remove the rocker train with the head still bolts down?If not can you somehow get all the valves to close.If you can,inject air pressure into one of the cylinders with low compression and see if air comes out the plug hole of the other low cylinder.if it does you have a cross leak problem,if it doesn't then that is not your problem.While the air is still hooked into the cylinder listen for leakage out the tailpipe or out thru the intake manifold.Whichever one leak that valve has a sealing problem. John.
1970 Dodge Charger R/T S.E.
1969 Dodge Dart GTS 440 M-Code
1970 Dodge Charger 500 383/4-speed w/A.C.
|
|
|
Re: Can NOT get this head to seal..!
[Re: charge70]
#708867
05/28/10 08:16 PM
05/28/10 08:16 PM
|
Joined: Feb 2006
Posts: 643 southern conn
1969gtx
mopar
|
mopar
Joined: Feb 2006
Posts: 643
southern conn
|
hi you need to do a leak down test bring one of cly. the low comp. tdc compression stock ad air through the spark plug hole not leting the crank to turn then with a small rubber hose up close to your ear an listen to the intake for air then exhaust & the other low cly.at spark hole were you hear air leak is were the compression is going
1965 A/FX Plymouth 9.50 et @139 mph 1965 A/FX awb plymouth flashback [email]10.26@129mph[/email] mph on pump gas 426 hemi 1969 GTX Hemi 4 speed 12.50 et @ 112mph in F.A.S.T TRIM 1970 GTX 4406pac 4 speed 11.05 @126.9 mph in F.A.S.T TRIM http://www.AFXER.com
|
|
|
|
|