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Old 03-04-2011, 09:44 AM   #1 (permalink)
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Default 94 sammy may have head gasket problem now

before i begin, to everyone that has been helping me get through the issues my samurai has been giving me, thank you.

I can't be sure if i have a leak in my head gasket. the only symptom i'm seeing is a small amount of oil/water mix on the inside of my oil cap. i only see the "milkshake oil" when the engine hasn't had time to heat up yet. once i reach operating temp, all i see on the cap is oil. there are no other symptoms that would point to a blown head gasket. not overheating, no knock, no loss in compression. is there something else that could be getting water in the oil? or is this a leak in the gasket that just isn't big enough to cause any of the other symptoms?
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Old 03-19-2011, 03:00 PM   #2 (permalink)
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AHHHHHHHHHHHHHHHHH!!!!!! driving down the highway last night, i started losing power fast. i limped my way to a parking lot and my folks were kind enough to tow me down to the shop i do my work at. she's running really rough, the engine will idle, but misfires a little while idling, and misfires a lot when under load. she's got good spark. i did a compression test and got these numbers:

cylinder psi
1 155
2 150
3 150
4 155

if i'm not mistaken, those numbers are a lot lower than they should be, and i need a new head gasket. but i don't have any other symptoms. the oil/water mix isn't showing up on my oil cap anymore. and, the engine isn't getting anywhere near overheating. i need some insight.
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Old 03-19-2011, 05:18 PM   #3 (permalink)
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Quote:
Originally Posted by djamp1983 View Post
I did a compression test and got these numbers:

cylinder psi
1 155
2 150
3 150
4 155
According to the Service Manual they should be around 199 PSI normal and the low end speck is 170 PSI.
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Old 03-19-2011, 11:30 PM   #4 (permalink)
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if you don't have imulsion in your oil or in your coolant then you may not have a head gasket issue. The compression could be off from the valve timing being off (slipped a tooth on the timing belt) could be worn rings as well. that would cause some extra pressure in the crank case and the condensation that forms could cause an emulsified appearance to oil on the cap or in the breather tube.

since all the numbers seem to be off by the same increment, i'm betting on valve timing
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Old 03-21-2011, 08:38 AM   #5 (permalink)
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I checked the timing belt, the marks are right where they should be after turning the crank by hand two rotations. when i replaced the busted rocker arm, i when through all the valves and adjustd the lashing. could it be i just didn't tighten the lockdown nuts enough and now my lashing is way off on a few valves?
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Old 03-21-2011, 09:01 AM   #6 (permalink)
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Sounds like the compression is a littlelow but that is not low enough to cause much of a drivablility problem. It could be the valve timeing but I would lean more towards a ignition problem or fuel problem. A misfire under load general points to an ignition problem, but could also be you are loosing fuel pressure. Your head gasket is not bad that is just normal condensation in oil cap.
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Old 03-21-2011, 09:31 AM   #7 (permalink)
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Unless the valve lash was set incorrectly on all of the valves you wouldn't have that consistant a compression loss on every cylender from a couple lock down nuts working loose. When I set my valve lash according to the specs, the mechanic working on my engine 2 weeks later told me my valve lash was off. He told me it looked like someone set all of them at the same increment out of spec. So either my feeler gauge is off, or I'm useing improper technique.

Like Camisami said, the compression isn't up to par, but you should still be able to drive it like that and you shouldn't have a rough skipping idle from it being down 20 or 30psi. The ignition is the easiest part to inspect and I'd rule that out first before I started tackling fuel delivery.
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Old 03-21-2011, 09:55 AM   #8 (permalink)
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timing's where it should be, and i've got good spark on all four plugs. i think ignition has effectively been ruled out.
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Old 03-21-2011, 02:20 PM   #9 (permalink)
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on 94 models they used the throttle body injector. Maybe you have a faulty temperature sender. It helps regulate the mixture, which could be the cause of your power loss. Check fuel pump and make sure it's operating at the correct pressure and that it's pumping fuel.
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Old 03-21-2011, 02:25 PM   #10 (permalink)
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do you mean the intake temp sensor? i just replaced it about 3000 miles ago, just before i discovered the broken rocker arm. because the check engine light would come on every once in a while and that was the only error code i got.

i know the pump is working, the engine is getting fuel. and judjing by the smell of the exhaust, it's actually burning rich.
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