main cap bolt size.1989 3.9

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nickm
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main cap bolt size.1989 3.9

Post by nickm »

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


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adamnreeves
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Re: main cap bolt size.1989 3.9

Post by adamnreeves »

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
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Rossco
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Post by Rossco »

9/16" UNC comes to mind but I'd have to check when I'm in the workshop later
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jrv8
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Post by jrv8 »

Hi,

They are 1/2" UNC

Jim
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Rossco
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Post by Rossco »

Oh well I was only a 16th out :shock:
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nickm
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Post by nickm »

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
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Rossco
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Post by Rossco »

Is that the alloy one that's kind of triangular?
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adamnreeves
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Post by adamnreeves »

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
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nickm
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Post by nickm »

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

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.
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Post by katanaman »

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.
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nickm
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Post by nickm »

I am fitting the SD1 cover and P6 water pump.
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