Quote:
Originally posted by FV623
B61 were never made
As a point of fact, B61 were produced in quite large numbers, as I have worked on them.
The unwary often over-tighten the heads, 35-40lbs ft is the spec, the nuts along the exhaust side are eclipsed by the casting overhang.
I have made a special tool to fit the torque wrench to enable these to be tightened correctly.
The core plugs (or as the Americans have it, freeze-out plugs - which they never do anyway) are all screwed (unified special thread too) and cannot push out under freezing conditions.
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These core plugs are only there due to the casting process and not designed as a pressure release device in the case of a block freezing, this is why a block will crack before a plug comes out.
Richard