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MG MGA - Dizzy clamp
|Can someone remind me of the orientation of the dizzy clamp ring? It is not flat, so do you assemble it so there is a gap below the bolt holes or is it supposed to contact the block at that point ? Also, which side of the dizzy does the pinch bolt go, block side or outside?|
The stamped out center section of the mounting plate needs to stand proud of the engine block. In other words there should be a small gap.
All of my cars have had the pinch bolt on the block side.
|Further to this, can anyone advise what size bolts secure the dizzy clamp to the block, noting that I have a Marina 1800 engine block? Per Moss manual, code for the MBG engine bolt is GHF117. This is where confusion starts as a MGB BBS describes GHF117 as "UNF 1/4", but elsewhere it is described as "BSF 1/4". I understand UNF is 28tpi whereas BSF is 26tpi. The threads of the bolts I have are really worse for wear but appear 26tpi. I want to re-tap the block threads and replace the bolts.|
Assistance will be appreciated.
|I think they are all UNF, same as NF, 28 tpi. If you are unsure, take a new bolt of UNF and BSF and try them in the hole. The difference is enough to prevent entry very far. Don't retap until you are sure!!|
This thread was discussed between 21/11/2009 and 29/11/2009
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This thread is from the archive. The Live MG MGA BBS is active now.