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Supercharger Off - Preventative Maint. (Cooling System, Plugs/Coils/, SC Upgrade
Hi All,
I am posting again due to my thread getting derailed by other people who are experiencing plastic component cooling system failures. Everyone will have to due this service eventually. Please do not post "my car is leaking coolant everywhere, help" in this thread. I'm hoping this can be a resource in the future.
What I am looking for:
Parts List of MUST REPLACE cooling system items that are likely to fail. (My y pipe has failed, hence the need to remove supercharger). I have spent several hours here and would appreciate any input on parts numbers whether universal or R specific.
Other preventative maintenance items that should be done while I have greater access to the motor. Plugs/Coils? Is this significantly easier to do with the supercharger/intake manifold off? I will be following this guide https://www.jaguarforums.com/forum/x...change-145292/
Disconnect battery Lift car up Take off both under panels Loosen the radiator cap Drain radiator from drain **** using nickle coin in vice grips Remove the big 17mm allen nut from left side of engine to drain Remove wiper arms Remove main cowl Remove the cross bar Remove the secondary cowl Remove the fuel line cross Undo the connector for vacuum line on the right side of engine Remove the fat hose above engine from the air filter box Remove the air filter covers, remove the lower air filter box Remove the elbow for the intake in the front of radiator Remove the intake cross in the throttle body Remove the throttle body but leave the hose Remove the 10 screws for the intake manifold Pull intake forward and remove the electrical connector, then remove from car Remove the header tank Remove the hose in the lower radiator Remove the upper radiator hose Disconnect the hose going to the right side metal Remove the hose into the transmission cooler Remove the 4 screws holding on the thermostat and crossover plastic Remove everything else connected to the water lines Pull out the thermostat and all the hoses Remove the water pump Remove the plastic crossover for water pump Remove the rear crossover Remove the electrical and both water hoses from crossover Clean the intake valves Clean the throttle body and the maf sensors Remove and replace the idler, tensioner, and belt Replace all the plastic and hoses and reassemble
Last edited by VicVegas84; 07-21-2021 at 09:36 AM.
Well I got around to the rear crossover pipe, front crossover, water pump and the plastic pipe running to the oil cooler, and thermostat housing. None of them show any visible signs of failure.
Are there any other parts that have failed for others? I replaced the expansion tank about a year ago when my problems began.
I don't know if this will help, but my mechanic is suggesting regular coolant flushes to keep the coolant from turning too acidic and deteriorating the plastic components of the cooling system.
I don't know if this will help, but my mechanic is suggesting regular coolant flushes to keep the coolant from turning too acidic and deteriorating the plastic components of the cooling system.
The issue is really just heat cycling. The plastic is heated up and cooled down again and again and ultimately that makes it go brittle and crack under the pressure.
The issue is really just heat cycling. The plastic is heated up and cooled down again and again and ultimately that makes it go brittle and crack under the pressure.
It seems most of plastic components, main failure points have been replaced at some point, including the water pump. They all look in good shape and the water pump was the new style (at least not FoMoCo, the made in Italian part).
I disassembled the water pump and vanes were fine, no crusty leakage by the pulley.
Going to lose my mind on this job. I figured it was for sure the rear pipe when I started this job. Then figured it was the lower Y pipe, then the Water pump and/or the connector tube behind the water pump to oil cooler. None appear to have failed.
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Praying now that it was this small plastic part off the throttle body as this is the only part with any crusty coolant stains on it. Thinking it may have come loose.
What I'm dreading is it's combustion gases from a blown head gasket/warped head/block that's pressurizing the cooling system as I have read of other similar failures though mostly on NA 5.0's. I have never heard of a head gasket failing like this before. All the plugs looked identical, and I don't remember it ever smoking so I don't believe I'm burning any coolant.
What I do know is my coolant leak seemed to get progressively worse. And I could smell it burning in the cabin after WOT as of it was dripping on hot engine parts.
This would all seemingly stem from a coolant expansion tank that was slowly weeping that then failed spectacularly with coolant spraying all over the bay and out of the cowls in the hood while driving. I noticed bubbles on the tank at the time which would seem to be pressurization. I replaced the tank and did not have any further issues (noticeably) until probably a thousand miles later when I noticed coolant on my driveway, then noticed after another drive it was considerably worse.
What's the status of your oil? Thought typically with a blown head gasket you get milky white coloration in the oil
As you say, not common on that engine. So hopefully it's a leak somewhere (much more common...)
What's the status of your oil? Thought typically with a blown head gasket you get milky white coloration in the oil
As you say, not common on that engine. So hopefully it's a leak somewhere (much more common...)
No cross contamination. Looking at the heads and water jackets I can see how you could blow at HG and not mix oil and coolant.
Seems rare even on these motors but not out of the question.
Fingers crossed it's just a leak. But so many places it could be that it's a bit of a hunt. But sounds like you're losing enough that it should be evident when you find it!
Fingers crossed it's just a leak. But so many places it could be that it's a bit of a hunt. But sounds like you're losing enough that it should be evident when you find it!
I'm going to leave off the NVH panels on the coils/fuel rail as well as the bulkhead style cover protecting the fuse panel, and the under tray to see if I can more easily identify the leak. I did find this on the water pump tonight which I believe is the weep hole. Maybe I'll luck out and it's just the water pump. Fingers crossed.
I am replacing the rear crossover, lower front Y pipe, thermostat/housing, and water pump. I replaced some vacuum lines, namely the diverter looking valve rubber hose which literally crumbled when I removed it. I did spark plugs, and cleaned the carbon off the valves. I also recently replaced the expansion tank.
I have the 4.2 so no real help for your model except this. Replace or super inspect every rubber and plastic hose or doohickey you can see and use perfect seal or aviation liquid gasket on all gaskets and rubber rings. Just a thin coat. Works on metal great also
07-21-2021, 09:27 AM
Supercharger Off - Preventative Maint. (Cooling System, Plugs/Coils/, SC Upgrade
