Christian S. Hansen
Post Number: 286
|Posted on Monday, 27 June, 2016 - 01:21 pm: |
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.
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?
Post Number: 16
|Posted on Wednesday, 13 July, 2016 - 01:38 pm: |
If you look at the following document pages 10 and 11.
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.
Post Number: 263
|Posted on Thursday, 14 July, 2016 - 02:05 am: |
The locating bolt hole is farther forward on the water pump housing:
Christian S. Hansen
Post Number: 316
|Posted on Thursday, 14 July, 2016 - 04:45 am: |
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?
Omar M. Shams
Post Number: 722
|Posted on Thursday, 14 July, 2016 - 05:13 am: |
It holds the bearing in place. To stop it from spinning in the housing.
Robert Noel Reddington
Post Number: 1030
|Posted on Thursday, 14 July, 2016 - 05:24 am: |
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.
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.
Post Number: 1692
|Posted on Tuesday, 26 December, 2017 - 08:09 pm: |
Cripes oil in that hole will be a disaster!
The hole is a sight hole to check the carbon running surface of the seal for wear and run out.
Any oil with dust etc that has built up will gum up the surface also oil will not do the seal sprung housing any good.
Did a pump overhaul [easy job with correct tools] and forgot to check on run out on the counterface before assembly, on completion a check through the sight hole showed run out.
If used the seal would of have failed giving a short working life of the pump.
Another kit was reinstalled and all ok.
Post Number: 1974
|Posted on Wednesday, 27 December, 2017 - 07:19 pm: |
The weep hole is good for showing water leaks nice and early but also for keeping moisture away from the bearings.
Any weep would fill the void and then rust the bearings causing them to fail / seize / possibly self distruct.
Post Number: 1697
|Posted on Wednesday, 27 December, 2017 - 09:46 pm: |
Weep hole bottom, sight check hole from memory is 90 degrees o/s.