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  1. #1
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    155

    Default Anybody replaced a valve guide?

    Has anybody any smart advice on doing this?

    I bought a cylinder head which is in excellent nick except one valve guide was damaged. It took a lot of effort to remove. I managed it by heating the head in the oven and using a big round punch. The guide was even more damaged but the head is okay.

    First problem is that MB donít sell replacements only the complete head. Tried eBay and was sent one that doesnít fit (larger diameter). I have another in order from Poland which hopefully will be the right one.

    Just wondering if anybody else has done this before? If so, how did you get the new one in without damage?


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  2. #2

    Default Re: Anybody replaced a valve guide?

    I've never had to do new guides kn a car, only motorbikes, and J always taken them to a specialist. If you take the head bare it's usually not expensive.

    Try these guys...

    https://www.vdsperformance.co.uk/vol...rrey/dirty2-2/

    It's not clear from their website how extensive they go with head work, but they may be able to help, or direct you to someone who can.

    Good luck.
    Last edited by Chopper; 13th April 2019 at 07:25.
    2004 Smart Fortwo Passion Cabrio, low miles, relegated to summer fun.
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  3. #3

    Default Re: Anybody replaced a valve guide?

    They really should be pressed in, though I have used a big hammer with a suitable stepped punch that fits into the end of the guide.

    Don't forget that a new guide means the valve seat should be re-cut after fitting.

  4. #4

    Default Re: Anybody replaced a valve guide?

    https://www.smart-stuff.parts/450-fo...rts-371?page=2

    They sell almost everthing for a smart 450/451/452/454

  5. #5
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    155

    Default Anybody replaced a valve guide?

    Quote Originally Posted by ossy View Post
    https://www.smart-stuff.parts/450-fo...rts-371?page=2

    They sell almost everthing for a smart 450/451/452/454
    Thanks, I checked those guys. They donít sell the guides but I will get my new cam from there as they are cheaper than MB and have the correct Brabus part.


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  6. #6
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    155

    Default Anybody replaced a valve guide?

    Quote Originally Posted by mikerj View Post
    They really should be pressed in, though I have used a big hammer with a suitable stepped punch that fits into the end of the guide.

    Don't forget that a new guide means the valve seat should be re-cut after fitting.
    Thatís a good point. Iíll get the head skimmed just in case so I can also get the shop to recut the seat. I might even see if they have a hydraulic press. Iív got myself a stepped drift. The guides are very brittle and would be driven in by hitting the end that has been turned down to take the oil seal, so I can see it ending badly if I start hammering it. 😥


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  7. #7
    Join Date
    Jun 2005
    Location
    Aberdeenshire
    Posts
    2,077

    Default Re: Anybody replaced a valve guide?

    £2.35 each guide plus postage from Lithuania.
    Seller lists dimensions so you can confirm before ordering.
    https://www.ebay.co.uk/itm/Engine-Va...4383.l4275.c10

  8. #8
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    155

    Default Anybody replaced a valve guide?

    Thanks. Those are the wrong size again, but I did find one that should fit, also on eBay, but from Poland. Cost £15. Not arrived yet, but hopefully will do soon as then I can finish the rebuild.


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  9. #9
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    155

    Default Anybody replaced a valve guide?

    Update: the £15 eBay valve guide from Poland fits. Took the head to a machine shop in the end and they knocked it in for me. The trick is to heat the head to 200 degrees which is way hotter than I did to knock the old one out. Plus they put the new guide in the freezer. They also skimmed the head and stoned the valve seats so thatís all set to go.


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  10. #10
    Join Date
    Sep 2016
    Location
    Burnley
    Posts
    609

    Default Re: Anybody replaced a valve guide?

    The valves will need grinding after cutting.

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