 combustion chamber anomaly...crusty lava rocks, what is it and why is it there? |
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| sean_v8_914 |
 Feb 6 2007, 12:28 PM
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#1
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Chingon 601  Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541  |
2.0 D-jet with 5000 miles
notice how it is in teh upper third by the plug. nothing near the OD it is crusty. looks like lava rocks in the middle the head did not leak, pic is deceiving Attached thumbnail(s) 
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| sean_v8_914 |
Feb 6 2007, 12:29 PM
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#2
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
the back of the piston has brown varnish stain
Attached thumbnail(s) 
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| SLITS |
Feb 6 2007, 12:30 PM
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#3
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
Mainly deposits from shitty gas additives & some burnt oil. Not a problem ... clean it and reassemble.
Ok, so you posted a second image ..... I might take exception about the head leaking, but the photos are Ahandiesque that it is hard to tell. |
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| sean_v8_914 |
Feb 6 2007, 12:30 PM
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#4
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
that light spot is where I picked off a chunk
Attached thumbnail(s) 
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| Rusty |
Feb 6 2007, 12:31 PM
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#5
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Wanted: Engine case GA003709 Group: Admin Posts: 7,941 Joined: 24-December 02 From: North Alabama Member No.: 6 Region Association: Galt's Gulch
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Carbon build-up.
Running rich, probably. Burning oil, maybe? Looks like you might have had an oil leak there... cylinders not well sealed to the case. Good thing you caught it. (IMG:style_emoticons/default/smile.gif) |
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| sean_v8_914 |
Feb 6 2007, 12:33 PM
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#6
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
I think it was an event rather than an ongoing accumulation
any complaints about ARCO gas? I have been running 91. it pings a bit on 87 |
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| sean_v8_914 |
Feb 6 2007, 12:34 PM
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#7
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
the oily drool marks are from washing the outside prior to disassembly
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| sean_v8_914 |
Feb 6 2007, 12:35 PM
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#8
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
teh oil filler neck was leaking and caused a mess
PS. the motor always runs great(not right now while in pcs) |
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| sean_v8_914 |
Feb 6 2007, 12:39 PM
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#9
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
the plugs have always read lean...coffee cream brown with slight ashy white-ness
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| sean_v8_914 |
Feb 6 2007, 12:41 PM
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#10
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
the photos were taken by a German (H.M.)
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| SLITS |
Feb 6 2007, 12:41 PM
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#11
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
Back in the days Shell was the worst for similiar deposits .... the deposits would be white / grey if it were additives alone called ash deposits. Remember, you live in a state where to produce clean air out of vehicles and especially during the winter enough additives are added to fuel to choke any engine. It doesn't make the gas better, it just pleases the tree huggers, legislators and oil companies.
The brown on the back of the piston is normal with overheated oil. |
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| Dr. Roger |
Feb 6 2007, 12:43 PM
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#12
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A bat out of hell. Group: Members Posts: 3,944 Joined: 31-January 05 From: Hercules, California Member No.: 3,533 Region Association: Northern California |
second vote for crappy gas.
I used to work for a test fuel additive lab and that looks like it. I'd run that tank empty, put some techron high grade in with an injector additive, then run 76 high grade daily IMHO. Unless you have some unocal blue gas in your state. that shtuff was a top performer back when we were rating different fuels. |
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| SGB |
Feb 6 2007, 01:02 PM
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#13
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just visiting Group: Members Posts: 4,086 Joined: 8-March 03 From: Huntsville, AL Member No.: 404 Region Association: South East States |
Roger-
what type of gas do you use? There really is a difference? Hey, I have those aftermarket compression raising devices, too! I have been having 'em incrementally installed (apparently, b/c I buy CSOB gas). |
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| Dr. Roger |
Feb 6 2007, 04:29 PM
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#14
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A bat out of hell. Group: Members Posts: 3,944 Joined: 31-January 05 From: Hercules, California Member No.: 3,533 Region Association: Northern California |
I use chevron or an additive for cleanup. techron is sold to other oil companies and sold under other names. its about the best stuff on the market. I like to run something with methanol for daily driving (76 gas).
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