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  1. #21
    Join Date
    Jun 2005
    Location
    Aberdeenshire
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    2,088

    Default Re: How to replace a noisy tappet


  2. #22
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    159

    Default How to replace a noisy tappet

    Managed to get everything back together. Squashed the oil out of the tappets, they were all smooth after that apart from one which felt slightly grabby. I had a spare so included that in the rebuild. I didnít do any polishing of the cam (would feel a bit like polishing a turd at this point).

    With everything back, it started immediately. I must have got a dodgy connection somewhere though as the throttle isnít doing anything. Perhaps the revs rise by 150 rpm, but thatís all. Tried restarting but no different and now the engine light is on. Will have to get the MB Star on it tomorrow. Hopefully just a loose connector. Interesting that the knock knock knock Cortina sound seems to have gone. Sounds a bit clattery in general, but I am now sensitive having seen the ropey cam bearings. Time will tell, I might have the Cortina soundtrack back again.

    Amazingly fiddly job getting the cam cover off. Next time will hopefully be much quicker! One thing I learnt today is that a 5/16 AF (bi-hex) ratchet spanner is equivalent to a TORX T10.


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  3. #23
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    159

    Default How to replace a noisy tappet

    The carís back running again. Quite embarrassing really, I had left the throttle body electrical connector off. Doh!

    After a bit of driving, I can still hear the cam. Sounds like thereís more going on now than a single tappet. Maybe thereís some timing chain rattle as well. And sometimes, when switched off, thereís a couple of knocks before it stops.

    The suggestion fro Tolson of low oil pressure is sounding highly likely. The tappets would have no pressure and the timing chain adjuster would be weak as well. Very next job will be an oil pressure test.

    Could be looking at big ends, mains and a crank regrind, I suppose. But letís be positive for now. Maybe I can change the oil pump and by some sort of miracle, the bottom end will be undamaged!

    Is the oil pump a self contained unit or does it run in the crankcase and hence that could also be worn like the cam bearings in the head?

    Last question, and potentially contentious.... is it worth putting a can of STP or Wynnís oil conditioning gloop in the oil to help it survive until I get a chance to strip the engine down?


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  4. #24

    Default Re: How to replace a noisy tappet

    The oil pump housing is part of the crankcase unfortunately. The rotors and the cover are replaceable and not very expensive, but not much to be done if the housing is very badly damaged (they invariably have some scoring at higher mileage).


    When you had the cam cover off did things look reasonably clean or black/sludgy? Did the rollers on the followers look smooth/shiny and turn freely?


    Is the oil pressure light working i.e. does it light up with ignition on and engine not running? If so, and you aren't seeing the oil pressure light coming on at idle with the engine hot, then the oil pressure shouldn't be disastrously low. Well worth measuring though.

  5. #25
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    159

    Default How to replace a noisy tappet

    The cam lobes, tappets and followers looked super smooth and not worn at all. The insides of the cam housing and cover were nice and clean. No mayo and the vented box in the lid was clean inside too. I fitted a new breather pipe as the old one had been repaired with some rubber tube. A right PITA with a/c!!

    Oil light comes on and goes off as you would expect. But that might be just 10 psi!! Has anybody added an oil pressure gauge to their Smart? Should be mandatory if you ask me.

    Iíve yet to measure the compression, but I will shortly. I reckon that it will be fine as the plugs were pretty clean, good enough to go back in. No signs of oil burning, so the rings are hopefully okay.

    Is the jury still out on oil boosters/gloop?


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  6. #26

    Thumbs down Re: How to replace a noisy tappet

    The only gloop I've ever used is Wynns tappet cleaner (which did seem to work) but I've never used general purpose additives so can't really comment from experience. I'm very suspicious of anything with suspended solids (e.g. PTFE) in it however.

  7. #27
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    159

    Default How to replace a noisy tappet

    Got myself an oil pressure gauge from Amazon. Has a 0-100 psi gauge and was only £16. Which is great! Comes with two adapters, neither of which are M12x1.5 to fit the Smart, so had to spend a further £9 on another adaptor. Not so great!



    Anyway, I think it works okay. Results were - warm engine at idle 38 psi.



    At 3 - 4,000, the pressure tops out at about 65 psi.

    No picture as I was holding the gauge in one hand and poking the accelerator with a broomstick with the other 🙄

    I donít know how that compares to a healthy Smart? It would be good for an old British car.🤔


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    Last edited by Smartysmartface; 7th February 2019 at 13:29.

  8. #28
    Join Date
    Dec 2016
    Location
    Hampshire
    Posts
    371

    Default Re: How to replace a noisy tappet

    Looks like 38 to me, but that's still plenty for idle. IIRC low pressure switches are usually about 10psi.
    65 actually sounds high to me, but I've not dealt with 'modern' engines at this level of detail. When I was a lad 60 was about tops.
    2016, ForTwo cabriolet, 900 turbo, DCT, Prime Premium, unmodified.

  9. #29
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    159

    Default How to replace a noisy tappet

    Sorry, typo, 38 at idle. Iíll edit the post.


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  10. #30
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    159

    Default How to replace a noisy tappet

    Definitely agree with you on the subject of old engines. I doubt if an old Mini or Escort would be that good when brand new!


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