Another Snowball

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This topic contains 15 replies, has 6 voices, and was last updated by  pmossberg 4 weeks ago.

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  • #303994

    billnparts
    Participant

    @billnparts

    As you may have read, on the last Hillclimb, I had crankcase pressure issues.

    I decided to remove the separator which has been in place untouched for about 20 years.

    As the separator in under the intake , the side panel required removal.

    The separator occupies the hole the socked is pushed into midphoto.

    As the cam seal also blew,I  needed to replace the timing belt also.

    That lower damper fought me for two days. The radiator was removed as well as the grille shell to gain room to work.

    I lost.

    As I only use one belt in the center sheave, I’m going to run it as is.

    This is where we are now.

    When we pulled the lower gear off I saw that the woodruff key on the crankshaft snout was half worn away. This in turn allowed the crank timing gear to wiggle back and forth. I got lucky. I’ve had a short block on a stand in my basement forever with all intentions of rebuilding a spare engine. It had only one gear on it and it was the one I needed. It even had a good woodruff key. As of right now the gear is back on along with a new cam seal and new timing belt. More to do tomorrow.

    Bill Ascheman
    Fiberfab Ford
    Modified 5.0, 5sp., 4:11
    Autocross & Hillclimb
    "Drive Happy"

    #303995

    ricrx7
    Participant

    @ricrx7

    Will that chip cause any vibration?  Or are you going to just remove the remainder of the circle?

    1986 British Coach Works Type 52 (Sammy)
    1952 MGTD Volvo engine (for sale)

    #303996

    royal
    Participant

    @royal

    Bill, looks to me like you should rethink using the pulley as is, with the chip missing.  ….or you could make it round again with some easy lathe work.

    #303997

    edsnova
    Participant

    @edsnova

    I don’t think that little imbalance will matter. I’d maybe check to make sure it’s not cracking up though.

    Getting it done, man.

    #304000

    royal
    Participant

    @royal

    Engine balancing:  Very difficult and complex involving dynamics of rotating and reciprocating parts as well as static simple weight differences.  That said, I possibly go overboard and always apply  the shade tree standard of if it is visibly out of balance, it is too much.  I own a very accurate scale which measures down to small fractions of a gram and use it and often a balance scale when assembling.

    So, Ed may be right that it may not matter (at least at low engine speeds).  So the question is: “fish or cut bait?”. The best answer usually depends upon how close we are to dinner time.  I know that Bill races.  I know also that Bill still works and intends to attend the Air and Auto show in Virginia Beach in about a month.

    I assume, when racing, Bill gets up to 6,000 +/- rpm or so.  A dime weighs about .08 oz and I think that Bill’s “chip” would weigh a few dimes….and the chip is approximately 2″ (a guess) off the crank center-line.  Now we are getting into inch-ounces of force which relates to rotational speed.  And double the rpm is approximately 4 times the force.

    It might not seem like much but I once threw a driveshaft balance weight on my Jensen Healey and it cost me $1200 to find out why the vibration:  new tires – no change, wheel balancing three times – no change, plus driveshaft dynamic balancing- drove like new.  It was very noticeable at 70mph.  (Who would you get to dynamically balance a driveshaft?)

    No lathe?  Why not use the amateur shade tree trick of chucking up the pulley in a drill press at low speed and use an angle grinder to get rid of the ugly chip by “removing the remainder of the circle” and make it as concentric as you can?

    It may not be noticeable, and it may not matter.  But, it is not a corner that I would like to cut.  (Unless dinner was in 5 minutes.   🙂 )

    I’m looking forward to seeing you in Virginia Beach, – at Murphy’s Irish Pub, for dinner.

     

    • This reply was modified 1 month, 2 weeks ago by  royal.
    • This reply was modified 1 month, 2 weeks ago by  royal.
    #304004

    billnparts
    Participant

    @billnparts

    I epoxied that missing piece back into place yesterday. Today it looks as if it will hold. As that sheave is not in use all it has to do is spin. Hope it stays together at speed.

    Bill Ascheman
    Fiberfab Ford
    Modified 5.0, 5sp., 4:11
    Autocross & Hillclimb
    "Drive Happy"

    #304007

    edsnova
    Participant

    @edsnova

    I stand corrected, Roy. Thanks for the science.

    #304016

    billnparts
    Participant

    @billnparts

       I managed to get the thing fired up last night. Upon reassembly I found the crankshaft woodruff key as well as the timing belt crank gear keyway slot wore out. Basically the only thing holding the gear in place was the belt. I have a short block on a stand in the basement and luckily there was a good key and gear on that. If I get time tonight we’ll get it tuned.
    • This reply was modified 1 month, 2 weeks ago by  billnparts.

    Bill Ascheman
    Fiberfab Ford
    Modified 5.0, 5sp., 4:11
    Autocross & Hillclimb
    "Drive Happy"

    #304050

    billnparts
    Participant

    @billnparts

    Well, it runs. It also blows smoke out the vent on the catch can like a freaking locomotive.I just pulled a compression test. Three cylinders at 150. Number three is sitting at 10. I hope it’s only a head gasket. We’ll see how lucky I get after pulling the head. ☹️

    Bill Ascheman
    Fiberfab Ford
    Modified 5.0, 5sp., 4:11
    Autocross & Hillclimb
    "Drive Happy"

    #304051

    royal
    Participant

    @royal

    Bummer!  Hope it is the head gasket.

    #304052

    edsnova
    Participant

    @edsnova

    Good luck, Bill. Sorry for your trouble.

    #304054

    billnparts
    Participant

    @billnparts

    Looks like I’m gonna have a V8.

    Large chunk taken out of #3 piston. Cylinder wall looks untouched as well as the cylinder head. I have to pull the engine to effect repair, so I’ll keep it for a spare. I’ve already made up a parts list for the V8 conversion. All I’ve got to do is find it. It’s on paper.

    I’ll notify the folks at the car show in Pongo  that I won’t be on the showfield. I’ll have to drive something else.

    Bill Ascheman
    Fiberfab Ford
    Modified 5.0, 5sp., 4:11
    Autocross & Hillclimb
    "Drive Happy"

    #304055

    schu
    Participant

    @schu

    Bummer

     

    Sounds like the special Mini in the garage is coming out to play!

    #304056

    royal
    Participant

    @royal

    Darn shame about your engine.  But, am really glad to hear that you still plan on coming to the show in Pungo.

    #304057

    edsnova
    Participant

    @edsnova

    Dang, Bill, I don’t understand what happened. You totally babied that car.

    #304125

    pmossberg
    Keymaster

    @pmossberg

    The short version …

    Instead of a new pulley, I’ll install a V8! 😆

    Paul Mossberg
    1982 Classic Roadsters Ltd. Duchess (VW)
    2005 Intermeccanica Roadster

    If you own a TDr and are not in the Registry, please go to http://tdreplica.com/forums/topic/mg-td-replica-registry/ and register (you need to copy and paste the link)

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