350i Water Pump

350i Water Pump

Author
Discussion

adam quantrill

11,264 posts

206 months

Thursday 18th February
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For the seals, there's one on here that looks promising:


BlueWedgy

Original Poster:

128 posts

66 months

Thursday 18th February
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Adam, seems like you have most of the info to hand now.
What a pig it was to remove my pump (now off). It took an age.
4 of the bolts were Allen key heads (not the first ones used in the engine somewhere) and appear to be uncoated, so were rusted I had fears of breaking the bolt or rounding the hex. It seems that whoever built the engine just grabbed whatever was to hand. I have to keep making special tools to remove things. All of the hex head normal bolts removed without issue apart from the 2 nearest the alternator (seem far too long for the purpose), and not rusted at all.

The old pump appeared to be weeping out of the front and has some play. I guess it was a matter of time before it failed completely.
Now to cut the snout off the replacement pump and install. Getting there slowly no real rush as the car is not in use until it warms up.

Would you know offhand what bolts may need sealing against potential water seepage?

adam quantrill

11,264 posts

206 months

Thursday 18th February
quotequote all
You can get replacement bolts but avoid the stainless ones.
Also use loads of copaslip.

E.g. for the long ones https://www.brit-car.co.uk/product.php/84607/1965/..._flanged_head___discovery_1_range_rover_classic

but check the threads on the ones you pulled out, to me M8 seems a bit too wide?

BlueWedgy

Original Poster:

128 posts

66 months

Friday 19th February
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I think I mentioned before that V8's are a new beast to me, so learning on the job as they say.

I do have copaslip. I also have Aluminium Anti-Seize Compound, that appears to have a similar temperature range (alternative to Optimoly TA / Never Seez compound). It is a toss up between the 2.

Deffo not M8. I was under the impression that the threads were old English sizes.
1/4" - 20 UNC - 5 off @ 1.1/8" long
5/16" - 18 UNC - 3 off @ 4.3/4" long + 1 off @ 5.1/2" long

Although one of the longer bolts has been swapped for a stud and nut (one that holds the PS bracket to the block). this also appears to have wept water as it was tight to undo and appears rusty.



Edited by BlueWedgy on Friday 19th February 08:31

adam quantrill

11,264 posts

206 months

Friday 19th February
quotequote all
Yeah that sounds better.

The water weeping is the gasket, I usually smear both sides thinly with blue hylomar before installing.

However if there is anything mounted to the pump bolts these can cause issues through vibration.
On mine one of the blower mounts is onto the pump and ended up cracking the casing, so I welded it up adding extra material, and then added some extra mild steel straps to other water pump bolt heads to spread the load. It's been fine since, but hence my interest in rebuild kits so when it does go, I can re-use the strengthened casing.

I have quite a few takers on the facebook group for bearings and seals easily enough to justify ordering 20 sets.

BlueWedgy

Original Poster:

128 posts

66 months

Saturday 20th February
quotequote all
Thanks Adam.
Sounds like you have drummed up some business on the bearings and seals.
I did intend to use some sealant along with the gasket. I have 5 new proper hex head bolts (instead of the Allen key ones) on order so will reinstall the pump next week when they turn up.
Fingers crossed, that will be manifold and joints seen to and the water pump. Then onto the other batch of to-do's. Prior to an MOT in April. Hopefully, I can then have some Spring / Summer driving without my nose stuck either under the bonnet or the jacked-up car. clap

BlueWedgy

Original Poster:

128 posts

66 months

Wednesday 24th February
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Well, nothing is as it seems in the world of SD1 water pumps.
The water pump I procured is the same design as the second pump in the Enigmas post.
After cutting the threaded section off and some welding all was good, or was it?....

I bolted up the pump with little thought, went to put on the pulleys, huh the pump is stuck fast, reverse the process and remove the pump...more time wasted.

Bit of head-scratching and comparison of the 2 pumps. The net result was the impeller was 1mm more proud on the replacement pump than the original pump and failing on the inner surface of the front cover, a bit of fettling and the pump now spins when in situ, just hope I was not too heavy with the fettling.

This just leaves the PS to connect and fill the system with water and start to see if all this effort works or not.
Won't be overly surprised if not, or pleasantly surprised if all is good...kinda glass half full moment smile

I have made a real meal of this and spent probably double the amount of time I should have. Lucky I have a bit of time on my hands at the moment.

Update

Well started the car all was good for a bit then it dumped water on the garage floor, I guess a duff pump, oh hum save up some pennies and buy a new one.



Edited by BlueWedgy on Thursday 25th February 07:26


Edited by BlueWedgy on Thursday 25th February 11:40

adam quantrill

11,264 posts

206 months

Thursday 25th February
quotequote all
Where is it dumping from, the little vent hole? Or the gasket area (might just be crud on the gasket or not cleaned enough?)

BlueWedgy

Original Poster:

128 posts

66 months

Thursday 25th February
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It's pouring out of the vent hole.

adam quantrill

11,264 posts

206 months

Thursday 25th February
quotequote all
Oh dear dodgy seal then. Was it a used pump?
I always look carefully at the hole usually there's a tell-tale stain if it's been weeping before.
Just bought a brand new one off the flea but it's a landrover one so it won't fit.

BlueWedgy

Original Poster:

128 posts

66 months

Thursday 25th February
quotequote all
Yes, it was second user. It looked clean enough. No evidence of stains or having been cleaned. Always a gamble, of course, funds were limited so I took the gamble sometimes all is good other times not so as In my case.

If when I get a job I will buy a new one, at least the bolts will be easy to remove now that they are all hex hd, and have liberal amounts of anti seize, rather than those soppy Allen bolts.
The upside is it sounded (even with a leak) a whole bunch better than the old pump.

Any movement on the seals and bearings?

adam quantrill

11,264 posts

206 months

Thursday 25th February
quotequote all
I haven't ordered anything yet because the pump I've been looking at had what looks like a thicker shaft at the pulley end, so I just went into the garage to connect the battery charger and retrieved an old pump that was on the car originally, so I can make more measurements.

This old one also leaked from the little hole when last used, so as an experiment I just put some water in it and twiddled the shaft, but nothing came out, so it's hard to bench test I think without pressure on it.

BlueWedgy

Original Poster:

128 posts

66 months

Thursday 25th February
quotequote all
I wonder if someone has been reading this thread read

https://www.ebay.co.uk/itm/Rover-v8-water-pump-fro...

adam quantrill

11,264 posts

206 months

Friday 26th February
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I thought that was you! ;^) It came up on my auto search....


BlueWedgy

Original Poster:

128 posts

66 months

Saturday 27th February
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Not me just collecting them as I go along rolleyes

Just a thought I was wondering if this pump will work It's a TR8 version.
https://rimmerbros.com/Item--i-GWP204

I notice that the gasket is slightly different from this.


By the way Adam I came across this whilst hunting out a pump, I have no idea of the dims though?

https://www.dingocroft.co.uk/acatalog/Repair-kit-f...

Ray

Edited by BlueWedgy on Saturday 27th February 15:56

adam quantrill

11,264 posts

206 months

Sunday 28th February
quotequote all
Another one just popped up on fleabay with buy it now item number 363306530576

I would have emailed you but you don't allow it....

BlueWedgy

Original Poster:

128 posts

66 months

Sunday 28th February
quotequote all
Hi Adam,

Thanks yes had seen that, think it may be best to go new at some point. Don't want to be collecting more for possible refurb. However, I have been reading that new non OEM pumps have been failing via the weep hole very soon after fitting.
Oh thanks for nod on the email thingy, hopefully, I have corrected that just a tick box not ticked.

Looks like Robsport may be the place to go once restrictions are lifted.

Edited by BlueWedgy on Saturday 13th March 07:49

BlueWedgy

Original Poster:

128 posts

66 months

Friday 19th March
quotequote all
I thought I would follow this up......
I have now purchased and installed a GWP204 TR8 water pump and all is good for the time being. It is a Powertune version, this seems to be the only make of pumps around now. I have however read that these have been failing prematurely through the weep hole, I guess time will tell.
I went to Robsport in Royston for the pump, the price came in at £94.95 Inclusive complete with a new gasket. This is cheaper than Rimmer Bros TR8 version.

They are also a lot lot cheaper than GWP2149, which as far as I could tell should be a direct replacement (that is the same design as the original).

Hopefully, Adam may be able to get to a point of failed pump refurb kits.

biggrin