Water pump question:
#1
Water pump question:
So I was going to reinstall the water pump on my 2000 XJR and I pulled out the new gasket that I had ordered awhile back. It was only then that I noticed my gasket did not match the shape of my water pump. I was annoyed but figured I had just ordered the wrong part by mistake. The part I ordered was part no AJ83300 which is listed as fitting my car, the other part number listed is AJ88922, but when searching for that part I find it is the same shape as the gasket I already have. It seems every gasket I search for this car is this shape.
Below is a picture of my water pump, and a picture of the engine block where the water pump goes. The old gasket I took off matches this shape:
And here is a picture of my new gasket:
Why can't I seem to find a water pump of a water pump gasket that matches what came off my car??? Does anyone have a part number for it? Every part number I can find seems to be the wrong shape.
Below is a picture of my water pump, and a picture of the engine block where the water pump goes. The old gasket I took off matches this shape:
And here is a picture of my new gasket:
Why can't I seem to find a water pump of a water pump gasket that matches what came off my car??? Does anyone have a part number for it? Every part number I can find seems to be the wrong shape.
#2
Is that even the correct water pump? Does the new gasket you have pictured line up with the mounting holes on the block? The gasket itself looks correct. The gasket you have is exactly what I used on my 2002 XJR but the back of my water pump looks completely different.
https://www.jaguarclassicparts.com/u...p-4-0-litre-v8
It looks like there were several different original part numbers based on VIN and engine number but they ALL seem to have been superseded by one single replacement part number - AJ88912 for the water pump and AJ88922 for the gasket.
https://www.jaguarclassicparts.com/u...p-4-0-litre-v8
It looks like there were several different original part numbers based on VIN and engine number but they ALL seem to have been superseded by one single replacement part number - AJ88912 for the water pump and AJ88922 for the gasket.
Last edited by harvest14; 07-09-2019 at 09:17 PM.
#3
Is that even the correct water pump? Does the new gasket you have pictured line up with the mounting holes on the block? The gasket itself looks correct. The gasket you have is exactly what I used on my 2002 XJR but the back of my water pump looks completely different.
https://www.jaguarclassicparts.com/u...p-4-0-litre-v8
It looks like there were several different original part numbers based on VIN and engine number but they ALL seem to have been superseded by one single replacement part number - AJ88912
https://www.jaguarclassicparts.com/u...p-4-0-litre-v8
It looks like there were several different original part numbers based on VIN and engine number but they ALL seem to have been superseded by one single replacement part number - AJ88912
I'm searched all the old part numbers as well and the one for every vin or engine number, they all seem to be the same shape as the gasket I have.
Also here is a picture of the old gasket, it matches the pump I have and the engine block:
#4
Here's a Jaguar parts guy who has an original gasket with the original part number for sale -- Only $11
https://shop.everydayxj.com/V8_Water...f7-aj83300.htm
It looks like the same shape though!
https://shop.everydayxj.com/V8_Water...f7-aj83300.htm
It looks like the same shape though!
Last edited by harvest14; 07-09-2019 at 10:00 PM.
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davidboger (07-13-2019)
#5
Otherwise, the genuine AJ88922 gasket looks like this:
#6
Here's a Jaguar parts guy who has an original gasket with the original part number for sale -- Only $11
https://shop.everydayxj.com/V8_Water...f7-aj83300.htm
It looks like the same shape though!
https://shop.everydayxj.com/V8_Water...f7-aj83300.htm
It looks like the same shape though!
#7
The water pump has two gaskets: one between the pump halves which is not separately available (the old black gasket you have shown) and another between the pump assembly and the engine block. You have not actually removed the complete pump assembly from the engine block but just separated the pump outer half from its inner half where the special gasket sits. If you pull out the half of the pump remaining attached to the block, you will find the gasket AJ88922 where your new aftermarket gasket will fit. The two pump halves are normally not separated, except for pump rebuilds. Once you have pulled the inner half of the pump out, join back the two pump halves using the old black gasket and some sealant on it. The two pump halves are held together by two short bolts (which you should not have removed), where shown on the pic by red circles. I have painted the heads of these two bolts red so that I do not accidentally undo them next time.
Otherwise, the genuine AJ88922 gasket looks like this:
Otherwise, the genuine AJ88922 gasket looks like this:
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#8
#9
The old gasket looks pretty good on the picture. Just clean it and clean the mating surfaces (do not scratch them) and assemble. You can use a very very thin coat of some liquid gasket sealant on it but it may not be necessary if the rubberised coating of the old (metal) gasket has no damages.
#10
The old gasket looks pretty good on the picture. Just clean it and clean the mating surfaces (do not scratch them) and assemble. You can use a very very thin coat of some liquid gasket sealant on it but it may not be necessary if the rubberised coating of the old (metal) gasket has no damages.
But thanks for solving this one for me.
#11
#13
#14
It seems that some engines had an o-ring for the water pump and some did not. There are two o-ring sizes, 55 and 70 mm, depending on the diameter of the round opening in the block. If used, the o-ring is placed at the opening of the engine block first, then goes the gasket then the pump. But. it seems that the o-ring was later omitted, probably with the revised gasket which has a sealing "rib" for the round opening in the block (see the pic of the genuine gasket I posted earlier). The old pump gasket on your engine was genuine and, if you did not find any o-ring there, that's how it goes (without o-ring). However, your new aftermarket gasket does not have any integrated rubberised seal around its big round hole so it will need an o-ring there. Alternatively, if there was no o-ring with your old genuine pump gasket, you can buy a new genuine gasket and assemble without any o-ring.
#15
It seems that some engines had an o-ring for the water pump and some did not. There are two o-ring sizes, 55 and 70 mm, depending on the diameter of the round opening in the block. If used, the o-ring is placed at the opening of the engine block first, then goes the gasket then the pump. But. it seems that the o-ring was later omitted, probably with the revised gasket which has a sealing "rib" for the round opening in the block (see the pic of the genuine gasket I posted earlier). The old pump gasket on your engine was genuine and, if you did not find any o-ring there, that's how it goes (without o-ring). However, your new aftermarket gasket does not have any integrated rubberised seal around its big round hole so it will need an o-ring there. Alternatively, if there was no o-ring with your old genuine pump gasket, you can buy a new genuine gasket and assemble without any o-ring.
#16
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