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MG TD TF 1500 - Water pump bolt size

So, what size and type wrench is needed for water pump bolts? They seem to be between a 13 & 14 metric, and between 1/2 and 9/16 standard. ???
Cheers, Frank
Frank Bice

Mad metric, 5/16 BSF wrench, the bolt is either 6 or 8 by 1.0 metric. I can't remember which. You need a 5/16 BSF wrench, nothing else will do. British tool and fasteners has very high quality fully polished wrenches at very reasonable prices.
D. Sander

Frank, see http://www.ttalk.info/Fasteners-For-XPAG-XPEG-Engines.htm for some info on that topic. Thanks to Dave DuBois. Bud
Bud Krueger

Thank you....you did mean to say 5, as in five, /16 BSF......correct?
Frank Bice

That should be 1/4W spanner (the other end of the 5/16 spanner). Cheers - Dve
D W DuBois

They are 8mm threads.
Geoffrey M Baker

The bolt is a 5 x 0.75 mm (French Standard Metric) with a Whitworth head

I thought the head was 3/16 BSF not 5/16 BSF (1/8 W not 1/4 W)
Don Harmer

I thought it was two bolts and two studs, nuts are smaller than the bolts if I remember right? could be wrong.
mog

I am an idiot! I ought to read more carefully!
I was talking about the fan bolts ( 5 x 0.75 mm) with 3/16 BSF heads
not the bolts from pump to block ( 8 X 1 mm) which are 5/16 BSF Wrench heads that you were asking about.

You will find that a 5/16 BSF (1/4 W) wrench fits most of the bolts and nuts on a T series car ( Followed by a 1/4 BSF (3/16 W) wrench)

Unfortunately the 5/16 BSF (1/4 W) head is not fit well by either metric or US wrenches of similar across the flats sizes ( they are all too big)

If you only could have one wrench, get an open end 1/4 BSF on one end and a 5/16 BSF on the other ( 3/16 and 1/4 W)

If 2 wrenches then I vote for a 2BA for the carbs and then a duplicate of the above i a box wrench

Don Harmer

Don, I was wondering what you were referring to :) mog, I don't recall studs, I thought it was four bolts but different lengths, two to accommodate the engine stabilizer bracket on the left (looking from the front of the engine back). But I'd have to check to be sure...
Geoffrey M Baker

service parts list shows, 2 bolts, 1 stud long, 1 stud short
mog

Thanks mog. Of course, someone could have replaced the studs with bolts at any time in the past!
Geoffrey M Baker

And I look at the manual and yes, it shows two studs. Now I wonder why a) they used studs in this situation and b) why someone replaced mine with bolts?

I guess at sixty plus years old, there is little left on these cars that some PO hasn't tinkered with at some time :)
Geoffrey M Baker

The studs make remounting the pump easier,,,but I don't think that is the reason that they are used,,,
SPW
Steve Wincze

Studs should always be used in blind holes. If a bolt is used instead there is no way of being sure that it is clamping the mating parts. the risk is that it could be bottoming in the hole.

John

52 TD
J Scragg

Correct.....there are two bolts and two studs. I ordered a set of Whitworth wrenches from British Tool, should arrive tomorrow. Thanks all!!
Cheers,
Frank
Frank Bice

This thread was discussed between 12/04/2015 and 14/04/2015

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