MPJG Fastener Size

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Steve Simmons
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MPJG Fastener Size

Post by Steve Simmons » Thu May 09, 2019 1:24 pm

As I recall, the threads on an MPJG are the same "mad metric" as XPAG. 8x1.0mm, etc. Can someone confirm that I'm remembering correctly? I'm away from the engine at the moment and need to order a few things, namely rear bolts.
1949 TC8975 / XPAG 9609
1949 TC9849 EXU / XPAG 10507
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frenchblatter
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Re: MPJG Fastener Size

Post by frenchblatter » Thu May 09, 2019 3:11 pm

Steve, as far as I'm aware all MG (and athers) were metric threads with Whitworth spanner sizes. The tooling folowed on from Moriis's purchase of Hotchkiss engines after the first world war (The factory was set up in the uK to keep it away from the Germans)
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Steve Simmons
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Re: MPJG Fastener Size

Post by Steve Simmons » Thu May 09, 2019 3:21 pm

Not all M.G. engines were Metric, but I know those around the WWII era were. I just can't remember if there were exceptions in the early 30s. I'm pretty sure the MPJG was though. I'll be able to measure tonight if need be.
1949 TC8975 / XPAG 9609
1949 TC9849 EXU / XPAG 10507
http://www.mgnuts.com

martinjames
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Re: MPJG Fastener Size

Post by martinjames » Sun May 12, 2019 11:30 am

There is quite a mixture of threads on the MPJG. For instance the fan is held on with four 2BA bolts.

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Re: MPJG Fastener Size

Post by Steve Simmons » Mon May 13, 2019 4:34 pm

Confirmed, rear bolts are 8mm x 1.0mm
1949 TC8975 / XPAG 9609
1949 TC9849 EXU / XPAG 10507
http://www.mgnuts.com

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Re: MPJG Fastener Size

Post by cdrolshagen » Mon May 13, 2019 11:21 pm

Hi Martin,
no, the fan is held by 4 bolts M5 x 0,75 mm, a very odd thread,
cheers Carl

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Re: MPJG Fastener Size

Post by Steve Simmons » Tue May 14, 2019 9:41 am

Anyone know the timing cover thread size on MPJG?
1949 TC8975 / XPAG 9609
1949 TC9849 EXU / XPAG 10507
http://www.mgnuts.com

Bill Davis
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Re: MPJG Fastener Size

Post by Bill Davis » Wed May 22, 2019 7:12 am

Steve,
I’m a little late in finding this but according to a list compiled by Bob Butson the MPJG Timing Cover uses 8 - 1MM 3/4” long bolts. He also gives part numbers from Moss (320-260) and Abingdon Spares (Use 3 - 39).
Cheers,
Bill

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Re: MPJG Fastener Size

Post by Bill Davis » Wed May 22, 2019 7:46 am

Steve,
In another doc I’ve found Bob Butson lists this:
Timing Chain Cover, eleven used:
cover to front mounting plate……...Five used……….M8x1, length 13mm. Bolt 5mm unthreaded. Head size 5/16 BSF.
cover through front mounting plate..Three used……..M8x1, length 15mm. Bolt 5mm unthreaded. Head size 5/16 BSF. (Nuts used)
cover through to block…………….Three used…. … M8x1, length 20mm. Bolt 5mm unthreaded. Head size 5/16 BSF.

I was thinking that they weren’t all the same length, as mentioned earlier, and this confirms.
Bill

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Re: MPJG Fastener Size

Post by Steve Simmons » Wed May 22, 2019 9:42 am

Thanks Bill! I don't know why I was thinking the timing cover bolts were smaller than 8mm.
1949 TC8975 / XPAG 9609
1949 TC9849 EXU / XPAG 10507
http://www.mgnuts.com

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