Decided to do the oil cooler delete!
#1
Decided to do the oil cooler delete!
So i noticed that my 93 xjs 4.0 was leaving oil puddles in the work parking lot and in looking i saw lots of oil from the oil cooler block that’s bolted behind the oil filter. After some debate, i decided just to do as others have done and am removing the block, and bolting the oil filter plate straight to the engine. Im in the process of putting everything back together now. We’ll see how it goes. It gave me a chance to do some other cleaning up in there that ive wanted to do too!
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On cars that never had an oil cooler fitted (many XJS including mine and XJ40s) there is a short bypass u-bend box that just bolts on where the oil cooler hoses exit the oil filter assembly. Prone to leakage due to the o rings that seal the arrangement becoming brittle over time. I had to replace my o rings and wrote up for the local Jag club. Copy of the article attached and hope it helps understand the arrangement. Maybe you could track down the fitment through a breaker?
I understand that it was only 6 cylinder cars that were exported to hot climates that were fitted with a cooler which I guess includes much of the US. I'll leave it to others to comment on the need for an oil cooler in your part of the world.
Cheers,
LeeP
The following 2 users liked this post by leep123:
Greg in France (08-07-2022),
ptjs1 (08-07-2022)
#5
I'm not convinced that any six cylinder XJS needed an oil cooler. 4 litre XJSs had oil coolers fitted in all countries, but the x300 XJ6 saloon with the same engine didn't have them fitted at all.
So why were they fitted to XJSs? I don't know? Did Jaguar think XJSs would be driven harder than the saloons? Is the airflow through the water radiator more marginal on the XJS? Who knows. All I would say is that IMO, 4 litre XJSs don't overheat if maintained properly. Any overheating problems that we hear about are where owners have a problem with the cooling fins on their radiator or internal clogging of the rad. And the fin damage on the lower third is often caused by oil leaks from the oil cooler anyway, as oil drips get thrown onto the fins, which then collects road dirt and debris and gradually deteriorate. So I reckon you're better off without it.
I have a couple of the bypass kits and next time my oil cooler or pipe lets go, I'll remove it and fit the bypass unit.
Paul
So why were they fitted to XJSs? I don't know? Did Jaguar think XJSs would be driven harder than the saloons? Is the airflow through the water radiator more marginal on the XJS? Who knows. All I would say is that IMO, 4 litre XJSs don't overheat if maintained properly. Any overheating problems that we hear about are where owners have a problem with the cooling fins on their radiator or internal clogging of the rad. And the fin damage on the lower third is often caused by oil leaks from the oil cooler anyway, as oil drips get thrown onto the fins, which then collects road dirt and debris and gradually deteriorate. So I reckon you're better off without it.
I have a couple of the bypass kits and next time my oil cooler or pipe lets go, I'll remove it and fit the bypass unit.
Paul
The following 3 users liked this post by ptjs1:
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The following 3 users liked this post by Vee:
#8
Basically I just did a web search on the oil cooler hoses and o-ring leaks and after much reading about deleting everything, and seeing that the "fix for leaky o-rings" issued by Jaguar was to delete the hoses and the cooler, i decided id just do it..
The following 3 users liked this post by Timeisrelative:
#9
So i did it. Of course while i was there i cleaned my throttle body, leaving the tps in place, figuring that may be the best was. Of course then i decided “shucks! Theres no gaskets whatsoever between the throttle body and the manifold or between the elbow connector and the throttle body! Maybe that’s why I have had a shudder at throttle let off!” So i made gaskets and installed them. Of course now that i have it all back together, it starts immediately, then shuts off immediately. Argh! Looks like ill probably have to take some of it back apart, after i have someone else try to start it so i can see if i see anything i missed.
#10
There is no gasket between the manifold and the throttle body. I can't imagine it would hurt, but be careful not to block anything with your homemade gasket. I think I unknowingly did when I tried the same thing. I would recommend just applying some Permatex Permashield #85420 if you want to apply something. Its fuel resistant and stays pliable.
I'm not sure what you're talking about regarding the elbow connector and throttle body. Should be a rubber boot with a giant hose clamp?
I'm not sure what you're talking about regarding the elbow connector and throttle body. Should be a rubber boot with a giant hose clamp?
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The following users liked this post:
Greg in France (08-09-2022)
#13
So yeah, after my son got home we checked and i have to take the throttle body off again. Pretty good vacuum leak at the throttle body. Ill have to take it apart again. As for the bypass valve, im not positive, but I read that the oil filter itself has a built-in valve just in case too. I guess we'll see
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The following users liked this post:
Timeisrelative (08-09-2022)
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I would have been more surprised to hear the your oil pressure sensor WASN'T leaking. Seems I have to fiddle with mine every two years, or less!
As far as the intake manifold, how the hell does that happen? I doubt you did anything to break it, it was probably hanging on by a thread on some previous impact.
As far as the intake manifold, how the hell does that happen? I doubt you did anything to break it, it was probably hanging on by a thread on some previous impact.
#20
So i found and ordered a complete intake manifold on ebay for $95 shipped from California! I figured id then have some spare parts laying around lol. Also i pulled my oil pressure switch and its leaking around the plastic, so i bought a new one. Hope to have her up and running by the middle of the week!