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Old 28-11-03, 23:31
Richard Farrant's Avatar
Richard Farrant Richard Farrant is offline
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Join Date: Feb 2003
Location: Kent, England
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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.
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
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