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Engine rebuild progress

Discussion in '365 GT4 2+2/400/412' started by squidmark, Feb 5, 2012.

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  1. squidmark

    squidmark Karting

    Sep 11, 2011
    137
    Oxford
    Full Name:
    Howard Dent
    #1 squidmark, Feb 5, 2012
    Last edited by a moderator: Sep 7, 2017
    I thought my fellow V12 enthusiasts might like to see progress on my 365 engine rebuild - so here are a few from the various stages so far. The engine is pretty good condition overall, but historically had a water loss problem dating back to the eighties; the first picture shows no.2 exhaust port prior to stripping, and it is plain to see the heads have been off in the car before - check out the white silicon sealer.
    Having completely stripped the engine, I hot pressure tested the heads as it was fairly obvious that this was where the problem originated and it turned out that the fault was a pin hole in the base of the exhaust port itself! I think it's most likely there was a flaw in the casting - maybe a foreign object which had become embedded in the alloy at this point - anyway, it was a straight forward repair which has since been pressure tested ok.
    So now I'm at the point of bead blasting and painting all the alloy parts - as you can see from the pics. Next stage is to build up the heads with new valves and guides whilst I'm waiting for the block to be honed - unfortunately my cylinder honing machine is not working at present so I can't do it myself - luckily for me the pistons and liners are in excellent condition!
    Roll on summer!
    Howard.
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  2. Ashman

    Ashman Three Time F1 World Champ
    Owner Silver Subscribed

    Sep 5, 2002
    33,264
    MA
    Full Name:
    John
    #2 Ashman, Feb 5, 2012
    Howard

    Thanks for posting these and I'm looking forward to future updates.

    Just curious though: how many miles are on the engine and could you post a picture of one of the other cylinder's valves so that we can see the comparison?
     
  3. bilodeaulynn

    bilodeaulynn Karting

    May 1, 2005
    58
    #3 bilodeaulynn, Feb 5, 2012
    The more pics the better. It is greatly appreciated, as it can be a pain to stop progress long engough to pick up the camera, unless you have a helper snapping photos.
     
  4. bundas

    bundas F1 Veteran
    Owner

    Dec 31, 2005
    7,090
    lexington ky usa
    Full Name:
    mitchell barnes
    #4 bundas, Feb 6, 2012
    i have two of these motors down, both with the same problem. please update your progress. thanks
     
  5. brettski

    brettski Formula 3

    Feb 29, 2004
    1,754
    north of toronto
    Full Name:
    brett swaykoski
    #5 brettski, Feb 7, 2012
    good luck with the project Howard, keep us posted.

    Mitch, why don't we do something about those non-runners ?
    give me a call...i miss the old days when you'd call me and then immediately put me on hold or tell me that you gotta go with a promise to call me back... ; )
     
  6. willrace

    willrace Three Time F1 World Champ
    Owner Rossa Subscribed

    Oct 21, 2006
    34,987
    North Tay-has
    Full Name:
    Kurt
    #6 willrace, Feb 7, 2012
    <waits by the phone> :p








    Sorry, Brett. Couldn't resist.
     
  7. squidmark

    squidmark Karting

    Sep 11, 2011
    137
    Oxford
    Full Name:
    Howard Dent
    #7 squidmark, Feb 7, 2012
    Last edited by a moderator: Sep 7, 2017
    The engine had completed approx 45k (miles) from new, but very little since 2000 - mainly because of it's incontinence I think. I should be up front at this point and say that this not the original engine from my car, rather one from a GTC 4 - it's rather complicated but basically my car was bought for it's fully rebuilt engine (not run since 1997) and the remains were condemned for scrap along with the engine from the GTC (when the engine was removed as a replacement for the GTC - I said it was complicated!). Enter me - saviour to the cause, or something. Anyway, that's the tale, and don't ask for the ch.no. of the GTC as I don't know it!
    I am attaching pics of the complete head for you John, and one showing the corrosion on the head studs which we all know about - sorry for the poor pic, I had the phone on the wrong settings...
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  8. blkprlz

    blkprlz Formula 3

    Mar 24, 2007
    2,169
    Tampa bay
    Full Name:
    Bruce
    #8 blkprlz, Feb 8, 2012
    Wow, what's the cause of the exhaust valve/port condition??
     
  9. brettski

    brettski Formula 3

    Feb 29, 2004
    1,754
    north of toronto
    Full Name:
    brett swaykoski
    #9 brettski, Feb 8, 2012
    he called, he called !

    it was great...sigh...
     
  10. willrace

    willrace Three Time F1 World Champ
    Owner Rossa Subscribed

    Oct 21, 2006
    34,987
    North Tay-has
    Full Name:
    Kurt
    #10 willrace, Feb 8, 2012
    <lights cigarette>
     
  11. brettski

    brettski Formula 3

    Feb 29, 2004
    1,754
    north of toronto
    Full Name:
    brett swaykoski
    #11 brettski, Feb 8, 2012
    make sure you've got one of those smoke's to savour after your first good ride in your 400...you'll need it.

    : )
     

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