Changing Head Gasket
Tuned
Joined: Oct 2004
Posts: 250
Likes: 6
From: new york
No Iomac, the motor can be repaired, Most machine shops can put a sleeve in the bad cylinder, its usually about a 100 bucks. But the motor has to be completely dissembled and clean before they will work on it or they will charge you their rate for doing the same
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
It is normal for some water to flow through the overflow.
Expansion and contraction of the coolant from cold to hot and back causes that.
Cavitation and blown head gaskets can put air in the cooling system.
The amount of air will depend on where the hole is and how big it is.
As far as compression, you should see in the 400 PSI range. High mileage motors will be lower.
The readings from cylinder to cylinder should be within 10% from the highest to lowest.
So if your highest reading is 400, the lowest should be over 360.
Expansion and contraction of the coolant from cold to hot and back causes that.
Cavitation and blown head gaskets can put air in the cooling system.
The amount of air will depend on where the hole is and how big it is.
As far as compression, you should see in the 400 PSI range. High mileage motors will be lower.
The readings from cylinder to cylinder should be within 10% from the highest to lowest.
So if your highest reading is 400, the lowest should be over 360.
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