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Old 09-24-2005, 07:08 PM
Blazin72's Avatar
You got a leaky spark tube...
 
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White smoke, water in oil...

I was helping my friend with his car today and we discovered a few problems. The car slowly began blowing more and more white smoke and we noticed some water in his oil. When we shut the car off we could hear a hissing through the oil dipstick tube which went away when I vented the pressure in the radiator. The engine has less than 5500 miles on it since we rebuilt it and it has an aluminum head. We checked the torque on the head studs since he had never done it since the engine was put together and two of the studs only had about 15 ft lbs of torque on them (ARP calls for 42 ft lbs with 10mmx1.25 studs) After that we pulled the spark plugs and the #1 plug had a white, crusty coating around the insulator and ground electrode that easily flakes off with a pocket knife, plug 3 had water on it and steam came out of the spark plug gole when I pulled that plug, plugs 2 and 4 looked like they were running a little rich but they werent too bad.

Does this sound like a blown head gasket?

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Old 09-24-2005, 07:16 PM
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Yep sounds like a head gasket to me, or your head is warped and not sealing like it should.


Brad
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Old 09-24-2005, 08:14 PM
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sounds like a big problem. The head has probably warped causing the gasket to blow, those improperly torqued studs would most certinly do that on a aluminum head. Get a new set of heads and torque them properly or get TTY ( Torque to yeild, measures in degrees rather than bolt torque values ) bolt specs and a TTY gauge, then follow the TTY torque sequence, might look like torque all bolts to 25 Ft/Lb then sequence bolts 1 and 2 90* which means you would set up your gauge on zero on the bolt(S) then turn it until it reads 90*.
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Old 09-25-2005, 10:46 AM
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Be sure to have the head checked out at a machine shop if you plan on re-using it.
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Old 09-25-2005, 11:32 AM
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I would say 100% that the head gasket is leaking. It probably isnt sitting right on the block since it is a fresh rebuild. Pull the heads off and bring them to a machine shop to be checked for warping and keep your fingers crossed that they arnt warped. Just had a head gasket blow in 1986 Toyota 4Runner mud truck
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Old 09-25-2005, 03:38 PM
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You got a leaky spark tube...
 
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Actually, I just found out that he (my friend) had in fact measured the flatness of the head with a straight edge before it was installed on the engine. He said that there was .003-.005" gap between the head and the straight edge when measured diagonally across the head between the #2 and #3 combustion chambers. That was new information to me.
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Old 09-25-2005, 04:02 PM
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Quote:
Originally Posted by Blazin72
Actually, I just found out that he (my friend) had in fact measured the flatness of the head with a straight edge before it was installed on the engine. He said that there was .003-.005" gap between the head and the straight edge when measured diagonally across the head between the #2 and #3 combustion chambers. That was new information to me.
Standard acceptable tolorance is only .003 so the heads need machining if he used a real precision flat bar, and not just any old bar, as with the standard bar, it itself could have a tolorance up to somthing like .010 and just look straight, the precision flat bar has somthing like a .001 Tolorance, so there a lot more accurate.
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