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Thread: Type S engine re-build

  1. #1
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    Type S engine re-build

    Hello Everyone,
    I have a 1966 Type S, 3.8 auto with 80,000 miles. Its running quite well, oil pressure is around 30-35 at 60mph, around 5-10 when idling, if you venture past 60, it drones quite loudly. I got an addative to make the oil "stonger", which got me an extra 5 psi. So I am wondering if the engine is tired enough to consider a re-build? Does anyone have an opinion? Also, can anyone recommend a specialist for a re-build? Thanks!

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    Super Moderator Ian D's Avatar
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    Thread moved to the correct section.
    Jaguar XK Coupe 4.2 2006 (2007 MY) indigo blue.

    Mods: Power-fold door mirrors, ally weave dash trim, late model chrome stalks, XKR pedals, ACM kit, Speedpack Spoiler, XKR exhaust, late model seat and window switches, Alston Suede roof lining, Upper/Lower Mesh grilles, Redstuff pads all round. Aerial removed and re-located to spoiler.

    Resident Super Moderator.
    V6 X-Type Oil Sump Replacement Guide


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    tks! sry, im a bit new to this.

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    Quote Originally Posted by sprig1963 View Post
    it drones quite loudly.
    Are you sure that "drone" is from the engine? And not a wheel bearing or something else?

    If you are completely sure it is from the engine, then yes, it definitely needs a rebuild.

    The oil pressure as quoted is low, but if it still performs well enough and is not making any untoward noises (see above) then leave it alone until a rebuild is strictly necessary and fits in with your budget.
    2000 Jaguar X308 4.0
    1973 Jensen Interceptor Mk III 7.2
    1969 Jensen Interceptor Mk I 6.3

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    hello,

    You could try to start replacing the bearing shells only.
    I did this on my s-type and a friends his MK2.
    The oil pressure came back to almost original. ( 50 PSi when driving )
    Replaced main and big-end bearings.
    This can be done with the engine in place, but you need to remove the front suspension subframe.
    Nice to have a carlift or pit.

    regards,
    Peter Jan

  6. #6
    Senior Member cass3958's Avatar
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    Before you go down the lines of rebuilding an engine because you have low oil pressure first you must understand how the oil is pressurised. On the XK engine the oil pump is in the sump surrounded by oil and pumping oil so not likely to have a lot of wear. The oil pump pumps the oil around the oil ways of the engine for lubrication and some of these oil ways on an older engine can get blocked or silted up but this would create a higher pressure just as an older person would have high blood pressure as their arteries get blocked. On most engine you have a pressure relief valve which on the S Type engine is situated on the oil filter housing. This is basically a plunger with a spring behind it. As the oil pressure rises the oil pushes against the plunger, the spring releases and the oil spills in to a secondary pipe and back in to the sump releasing the high pressure. As the engine gets older and the spring goes through many heat cycles it will weaken over time and will not be holding the plunger in place as well as it did and should. Your plunger might also be dirty and not making a perfect seal. Before you go down any route of rebuilding or stripping the engine spend 50p on a new spring, a couple of quid on a new plunger and five minutes of your time fitting it then see how that improves your oil pressure. The simple things are the easiest.
    Rob.C.
    1968 Jaguar S Type 3.4 Auto Old English white
    2006 X type SE 2.0d Estate
    1966 Ford Anglia 1760 X flow
    1993 Yamaha FJ1200
    1952 Alvis TA21 Red and Silver
    2012 Old English Sheep Dog White and Grey

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