The V8 Owners Forum -

Could anyone tell me what size and what thread type the main bearing cap bolts are?I have a slightly damaged thread in the block and would like to run a tap down it.Thanks Nick

I do not know Nick but if I am not certain I usually turn the bolt 2-3 turns through the die I think is right to check the size.

nickm wrote:Could anyone tell me what size and what thread type the main bearing cap bolts are?I have a slightly damaged thread in the block and would like to run a tap down it.Thanks Nick

9/16" UNC comes to mind but I'd have to check when I'm in the workshop later

Hi,

They are 1/2" UNC

Jim

Oh well I was only a 16th out

Thanks very much for that.By the way does anyone have a P6 or early RR alternator bracket as I need one to get the engine to fit in my Westfield.Thanks Nick

Is that the alloy one that's kind of triangular?

Nick,

I am building an SEiGHT. Have you looked at the westfield alternator bracketry.

nickm wrote:Thanks very much for that.By the way does anyone have a P6 or early RR alternator bracket as I need one to get the engine to fit in my Westfield.Thanks Nick

No.Does westfield supply the bracket?[my engine is an early 3.9].Cheers Nick.

I think the 3.9 runs the interim cover? If so then yes.

nickm wrote:No.Does westfield supply the bracket?[my engine is an early 3.9].Cheers Nick.

adamnreeves wrote:I think the 3.9 runs the interim cover? If so then yes.

nickm wrote:No.Does westfield supply the bracket?[my engine is an early 3.9].Cheers Nick.

Very very few 3.9 engines ran the interim cover.

P6 alternator bracket isn't going to work for it either unless you extend it or fit an SD1 front cover and P6 pump.

I am fitting the SD1 cover and P6 water pump.