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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 2007 indigo blue with many mods and retrofits.

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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

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    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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    1st thing is fit a mechanical pressure gauge
    Jaguar Keys & Remotes
    Castle Locks
    196 London Rd
    Hadleigh
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    07792 552423
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    castle.locks@btinternet.com

  8. #8
    Senior Member cass3958's Avatar
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    Quote Originally Posted by ponsaloti View Post
    1st thing is fit a mechanical pressure gauge
    Pray tell why? Unless you are assuming the electric gauge is not reading correctly which if so why not just have that refurbished or replaced rather than go through the hassle of modifying the whole system. But why would this be the first thing?
    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

  9. #9
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    1. Many years ago I worked for crow engineering in Chadwell Heath, then spent 3 years in the U.S restoring and rebuilding jag engines for mostly working for British Restorations in Philadelphia.
    I came home and carried on with this for another couple of years back in Essex.
    I've built between 50 to 100 old jag engines, so experience tells me to always assume these elec gauge's may be lying.
    Obviously your choice but you can screw in a gauge and monitor the true pressure then refit the old sender.

    2. If it is lying, you'll be throwing money away.

    I've never heard an engine drone. I'm guessing the droning noise is coming from the exhaust.

    Hope this helps
    Jaguar Keys & Remotes
    Castle Locks
    196 London Rd
    Hadleigh
    Essex
    SS7 2PD

    07792 552423
    01702 555557
    castle.locks@btinternet.com

  10. #10
    Senior Member cass3958's Avatar
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    I bow to your greater knowledge and apologies as it sounded like you were suggesting doing away with the electric gauge and installing a permanent mechanical one. That said on the Alvis coupe we are rebuilding at the moment we had very high oil pressure around 100psi so changed the oil pressure spring over from the Alvis saloon we have on the road and the pressure dropped on the coupe to 30 to 50 psi which is what the saloon had been running at. New spring bought for the coupe and the pressure is now back to the 30 to 50 it should be. It is nice when you have two of the same engines side by side and can swap parts over to check they work correctly. It could be on the Jaguar that a new spring will increase the oil pressure to what it should read but I also agree with you that checking the gauge is registering correctly is important.
    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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