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| Re: Blown head gasket |
Subject: Re: Blown head gasket
by mareospeedwagon on 2002/8/3 0:42:27
Hi Ya'll,
Sorry to be gone all week but I've been very busy. Thanks for all the info and stories on head gaskets. It would not have blown if I had taken the time to deal with the first wounds and slowed down a bit to keep it from overheating.
The center bolt closest to the distrubutor is the longest bolt on the A-series heads. I didn't know about it being part of the lubrication system, thanks for that info.
The head war scarred between #3 & 4 cylinders so I had to take it to a head shop and have it milled a bit. While I was there, I saw an A-block head on the shelf so I pulled it down and looked at it. It was an A12 high compression head with the heart shaped coubustion chamber. It was new and had never been bolted on a block yet. He said that it had been there since the 70s. I paid him $75 for it. The head that was on the A14 motor was a sort-of stock A12 head so I just put on the new HP head. It has the round ports. I spent two days with carbon router tips and sanding wheels just a porting away. I didn't take off anything metal that was needed but I smoothed the ports real well and made all of them the size of the manifold gasket port openings. I deburred everything in the chambers but left them alone pretty much.
I put the new distributor on it also and it wouldn't fire. I took it back to Advance Auto Parts and a new one should be there in the morning. So that means that I haven't been able to drive for a week now.
How could a distributor make a motor overheat?
With the Datsun distributors, they have a little triangular piece of plastic that holds three little ball bearings in place that the rotation spark advance plate sits on so the timing can advance when needed. This plastic gets old and cracks, letting the ball bearings come out of place and making the spark advance plate ride crooked. The spark is weakened as a results and the motor runs like it is in a rich fuel condition, which in turn, makes the engine overheat. El Stupido Grande, that's me, didn't stop and let the engine cool down causing severe overheating and the blowing of the head gasket.
Hopefully, tomorrow, Mareo Speedwagon SIX will be riding again.
 Mareo
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