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Christian S. Hansen
Prolific User
Username: enquiring_mind

Post Number: 286
Registered: 4-2015
Posted on Monday, 27 June, 2016 - 01:21 pm:   Edit PostDelete PostView Post/Check IP

Re: 1968 MPW Coupe - CRX2541
Amoung the other "oddities" that have piqued my curiosity while I have been fussing with this overheating problem is the water pump. There is a rather large (1/2" diameter) hole in its top. I understand that there is some sort of "weep" hole supposedly on the bottom that when leaking signals impending problems with the internal seals. Being located on the bottom makes sense, but having a hole, especially of a size where you can look down into the "innards", is a bit strange and seems like a sure entry route for all sorts of stuff, dirt, debris, oil, etc.

Is this normal? I know that it is "insane" to suspect that the pump has, at some ignominous point in the past, been installed upside down, but as we all well know, over the years of prior owners "fixing" something, stranger things have happened. So..what is the purpose of this hole?? Just wondering.

Water pump hole

P.S. Cautionary afterthought. I always hate making a fool of myself, and lest that has just happened again...all too frequently, I should humbly add...am I correct in even thinking that this is the water pump? It is just behind the pulley on the output shaft to which the radiator fan is connected. Even if not the pump, the question still remains...what is the purpose of this hole?
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ross kowalski
Experienced User
Username: cdfpw

Post Number: 16
Registered: 11-2015
Posted on Wednesday, 13 July, 2016 - 01:38 pm:   Edit PostDelete PostView Post/Check IP

If you look at the following document pages 10 and 11.

http://rrtechnical.info/sy/tsd2476/12.pdf

It appears that the figure L5 diagram has a locating bolt on the opposite side as the weep hole.

So, if you use an inspection mirror or feel with your finger if you can, and find that there is a locating bolt on the bottom of your water pump install, there is a good chance it is upside down.
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Jeff Young
Prolific User
Username: jeyjey

Post Number: 263
Registered: 10-2010
Posted on Thursday, 14 July, 2016 - 02:05 am:   Edit PostDelete PostView Post/Check IP

The locating bolt hole is farther forward on the water pump housing:



Cheers,
Jeff.
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Christian S. Hansen
Grand Master
Username: enquiring_mind

Post Number: 316
Registered: 4-2015
Posted on Thursday, 14 July, 2016 - 04:45 am:   Edit PostDelete PostView Post/Check IP

Ross...Thank you for that link. Upon review, it appears the hole is that for the "locating bolt" which is currently missing.

Jeff...Thank you for that photo which shows the "locating bolt".

So...that baits the question...just what does that bolt "locate" and what can come apart if it is not located...held in place, in other words...by the presence of that bolt? The manual illustrations confirm that the hole is for the "locating bolt" but none of the text that I could find discuss it, or its purpose. Does it have a critical function?
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Omar M. Shams
Grand Master
Username: omar

Post Number: 722
Registered: 4-2009
Posted on Thursday, 14 July, 2016 - 05:13 am:   Edit PostDelete PostView Post/Check IP

It holds the bearing in place. To stop it from spinning in the housing.
Thanks
Omar
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Robert Noel Reddington
Grand Master
Username: bob_uk

Post Number: 1030
Registered: 5-2015
Posted on Thursday, 14 July, 2016 - 05:24 am:   Edit PostDelete PostView Post/Check IP

Nice photo, like the DTI.

This is what I like to see, proper measuring stuff, tools and workshop manual.

I have no idea what this hole does. Is it threaded. Or a dowel hole.

What happens if oil is put in the hole.

BTW,
On some water pumps the bolt that locates the water pump bearing goes in to the side of the brgs outer sleeve. Sometimes the hole goes through the sleeve sometimes blind.
If it goes through then the brgs can be oiled or greased. 140 gear oil good. I had an Austin 1100 CGA 136B which by chance had a through hole.

Good little car that rusted away. Nice smooth ride hydra elastic suspension. Rubber bellows connected front to rear with alcohol based fluid. Very reliable. 85 mph. 1100 cc. 35 mpg.

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