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Re: Head with leaky valves advice needed [Re: rshaw125] #5007626
02/11/19 06:55 AM
02/11/19 06:55 AM
Joined: Aug 2004
Posts: 3,372
Raleigh ,NC CSA
rshaw125 Offline OP
rshaw125  Offline OP

Joined: Aug 2004
Posts: 3,372
Raleigh ,NC CSA
It's a 2004 DOHC. Dry compression test followed by wet. The two bad cylinders saw no improvement from added oil.
Visually the cam lobes look like new.
The head in question is going to the machine shop Wednesday. Trying to decide if the other head should go even if it does not leak water.
Thanks for the replies.


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Re: Head with leaky valves advice needed [Re: rshaw125] #5007668
02/11/19 07:47 AM
02/11/19 07:47 AM
Joined: Oct 2010
Posts: 768
RI
mattd Offline
mattd  Offline

Joined: Oct 2010
Posts: 768
RI
Did you perform a leakdown test?


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Re: Head with leaky valves advice needed [Re: rshaw125] #5007670
02/11/19 07:49 AM
02/11/19 07:49 AM
Joined: Jul 2005
Posts: 31,462
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 31,462
NY
Originally Posted by rshaw125
It's a 2004 DOHC.
The head in question is going to the machine shop Wednesday. Trying to decide if the other head should go even if it does not leak water.

Many years ago I worked in a machine shop, I learned quite a bit from some of the best machinists on L.I. The other head has just as much wear as the head in question, only it is not showing any symptoms, yet. You're halfway there labor wise to having that head done. Having said that, and forgetting ethics, if you're looking to sell the car fix the head in question and let the next person worry about it. If you want to keep the car, or care about ethics I'd do both heads. Imagine 6 months from now, or possibly less having to rip everything apart to do the other head. We are not talking a low mileage car here. I would say 8 out ten times we did heads in pairs.


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Re: Head with leaky valves advice needed [Re: rshaw125] #5007673
02/11/19 07:51 AM
02/11/19 07:51 AM
Joined: Feb 2007
Posts: 3,753
Southeast
meep Offline
meep  Offline

Joined: Feb 2007
Posts: 3,753
Southeast
stretched timing belt caused misfires/stumbles at idle and low rpm for me.

~50psi is very low pressure.

leaky EXH valve can also cause misfire if it's developing hotspots and causing preignition.


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Re: Head with leaky valves advice needed [Re: 46Harry] #5007674
02/11/19 07:52 AM
02/11/19 07:52 AM
Joined: Jan 2013
Posts: 2,390
Texas
WyrTwister Offline
WyrTwister  Offline

Joined: Jan 2013
Posts: 2,390
Texas
Originally Posted by 46Harry
Since the head is off and there is leakage from the valves, now would be a good time to get the head reconditioned especially since the engine has 150,000 miles on it.



Exactly what I was thinking .


Wyr
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Re: Head with leaky valves advice needed [Re: mattd] #5007687
02/11/19 08:12 AM
02/11/19 08:12 AM
Joined: Aug 2004
Posts: 3,372
Raleigh ,NC CSA
rshaw125 Offline OP
rshaw125  Offline OP

Joined: Aug 2004
Posts: 3,372
Raleigh ,NC CSA
Originally Posted by mattd
Did you perform a leakdown test?


No. The two low compression cylinders were also the one's that were misfiring. Also the one's with the leaky valves.


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Re: Head with leaky valves advice needed [Re: rshaw125] #5007713
02/11/19 08:40 AM
02/11/19 08:40 AM
Joined: Jan 2015
Posts: 921
missouri
ragtoplvr Online content
ragtoplvr  Online Content

Joined: Jan 2015
Posts: 921
missouri
Water is a poor choice to leak test valves, it normally does not wet out the surfaces and with the surface tension it normally takes a pretty big hole to leak thru without pressure. Alcohol is a better choice. Bet those valves would gush with alcohol. If the head is still on the engine the alcohol will burn off evaporate much quicker but you still must worry about hydrostatic lock.

Re: Head with leaky valves advice needed [Re: rshaw125] #5008274
02/11/19 06:42 PM
02/11/19 06:42 PM
Joined: Sep 2002
Posts: 3,533
Arkansastan
Propflux01 Offline
Propflux01  Offline

Joined: Sep 2002
Posts: 3,533
Arkansastan
Leak down test would have given more info. Since the head is off, recondition it, and press on with pride. If the misfire stops, you will know why.


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