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14-03-2019
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CrawlerStar
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Join Date: Jul 2010
Location: Newcastle upon Tyne GB
Posts: 437 What Jeep do I drive?: JK
Likes: 1
Liked 50 Times in 46 Posts
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Oil Drain Plug torques petrol & diesel different ?
Why is the recommended torque for the diesel drain plug double that of the petrol ?
54Nm (40ft-lbs) (seems a little excessive) to 20 ft-lbs on petrol
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15-03-2019
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RustysRocker
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Join Date: May 2007
Location: Manchester, UK
Age: 53
Posts: 1,335 What Jeep do I drive?: TJ
Likes: 18
Liked 123 Times in 94 Posts
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Could be down to a different sized thread, or different materials being used. Or it could just be the wrong info has got into the owners/service manuals (wouldn't be the first time).
I don't know anybody who torques sump plugs anyway. I just tighten the plug on my TJ as much as I think it needs. Tight is tight.
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15-03-2019
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AJOR Bronze
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Join Date: Mar 2014
Location: Lake Macquarie, NSW.
Age: 55
Posts: 2,603 What Jeep do I drive?: WK2
Likes: 793
Liked 1,248 Times in 855 Posts
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Diesels are a higher compression engine so internal pressures are higher.
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Cheers,
Jamie
MY15 WK2 GC Limited 3.0L. Ironman lift, bullbar & winch. Uneek rack & sliders
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15-03-2019
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CrawlerStar
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Join Date: Jul 2010
Location: Newcastle upon Tyne GB
Posts: 437 What Jeep do I drive?: JK
Likes: 1
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So will the sump for the diesel be more robustly made compared to petrol ?
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15-03-2019
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AJOR Bronze
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Join Date: Mar 2014
Location: Lake Macquarie, NSW.
Age: 55
Posts: 2,603 What Jeep do I drive?: WK2
Likes: 793
Liked 1,248 Times in 855 Posts
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Yes it will be as diesel engines are built stronger to cope with the pressures.
__________________
Cheers,
Jamie
MY15 WK2 GC Limited 3.0L. Ironman lift, bullbar & winch. Uneek rack & sliders
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16-03-2019
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SwampDigger
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Join Date: Jul 2010
Location: Blue mountains, West of Hell
Posts: 3,762 What Jeep do I drive?: JK
Likes: 1,479
Liked 540 Times in 399 Posts
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That sort of makes sense, but the sump shouldn't be pressurised... It has breathers that connect to the rocker covers & the PCV to suck the fumes out & feed the vapours into the inlet of the turbo.
So while the material of the sump might be stronger, the sump & sump plug are not structural parts, so why would it need to be tighter in the diesel?
__________________
Jeeps: Lego for grownups!
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16-03-2019
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CrawlerStar
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Join Date: Oct 2014
Posts: 269 What Jeep do I drive?: JK
Likes: 44
Liked 42 Times in 35 Posts
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It’s simply because the engines are made by different manufacturers.
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