Valve build up

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Valve build up #1016936 01/04/11 01:22 AM

Joined: Nov 2010

Posts: 95

Sanger, TX

RyanB

Getting the Wheeling Fever

I have a lot of build up on the exhaust valve on number 4 cylinder. Should I worry about this? I don't really have the money to rebuild the entire head, but I could replace the exhaust valves.

[Linked Image]

When I removed the piston it was cracked in 3 places and basically fell out of the cylinder. So I assume it had oil pouring into the cylinder. The block and cylinders were surprisingly in fairly good shape, I dropped it off to be honed and new pistons and rings installed.

Any advice is appreciated,

Ryan

1984 Mitsubishi Montero, 2.6l - 5 speed

Re: Valve build up [Re: RyanB] #1016937 01/04/11 12:06 PM

Joined: Feb 2007

Posts: 16

Niles, Ohio

Engine_Machine_Ser Offline

Need a Spot

You could wire brush that off, Be sure thats not a crack between the valves.

Randy

http://www.enginemachineservice.com

Re: Valve build up [Re: RyanB] #1016938 01/04/11 04:46 PM

Joined: Sep 2006

Posts: 2,712

East Wallyworld Vermont

OldColt

Roll Me Over

Roll the cam and get each valve to open and visually inspect the seating area for pitting and any other issues. If they look decent, run it. What I see is an oil buildup and since you had a known failure you do not need to go far to find an oiling issue.

Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.

Re: Valve build up [Re: OldColt] #1016939 01/04/11 05:45 PM

Joined: Jan 2001

Posts: 13,649

Helen , GA

fasteddy

Web Wheeler

I concur. I'd scrape/wirebrush/clean the vavle head if the seats and valve seat contact ring is clean and tight, just to get rid of potential hot spots that could cause preignition. I didn't see a problem crack. If there wasn't an incipient crack there, I'd worry...

Not responsible for advice not taken...

Re: Valve build up [Re: fasteddy] #1016940 01/04/11 11:52 PM

Joined: Nov 2010

Posts: 95

Sanger, TX

RyanB

Getting the Wheeling Fever

Thanks everyone! I will wire brush it clean and inspect to make sure there are no cracks.

I was hoping that would be your answer, my block will cost me about $600 by the time I get it out of the engine shop. But still - I should have a good running Montero for a little over $1200 total.

Thanks again,
Ryan

1984 Mitsubishi Montero, 2.6l - 5 speed

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