Oil Drain Plug torques petrol & diesel different ? - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand


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Default 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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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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Diesels are a higher compression engine so internal pressures are higher.
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So will the sump for the diesel be more robustly made compared to petrol ?
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Yes it will be as diesel engines are built stronger to cope with the pressures.
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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?
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Itís simply because the engines are made by different manufacturers.
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Quote:
Originally Posted by YamahaDOC View Post
Itís simply because the engines are made by different manufacturers.
And that's another reason why its different.
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The Diesel has a copper washer does the petrol have the same or a nylon ?
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