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Pressing in bushings .... KAWASAKI

Discussion in 'Mechanic and Repair' started by PicturePerfectLawns, Aug 31, 2014.

  1. Lawndered

    Lawndered LawnSite Member
    Messages: 2

    Just adding so OP is sure.
    Patriot is referring to the case as far as heating is concerned. Have read that 250f max on steel or heat can change monecula(?) composition. Pay to check alloys heating tolerances.

    dieselss is spot on with freezing the part you are inserting, pretty sure a shop would use liquid nitrogen, but that may be for time constraint concerns.

    This process is sometime used for putting bearing races (cups) into wheel hubs, where you freeze the race and heat the hub.
  2. Lawndered

    Lawndered LawnSite Member
    Messages: 2

    Sorry ...posting at the same time Dieselss!
  3. whiffyspark

    whiffyspark LawnSite Fanatic
    Messages: 6,506

    I wouldn't heat aluminum
    Posted via Mobile Device
  4. PicturePerfectLawns

    PicturePerfectLawns LawnSite Gold Member
    Messages: 3,845

    I don't know what I was thinking. That's what the Kawasaki mechanic was telling me. He told me about the freezing the bushing and heading the housing. I'm going to check with the machine shop and see how much they want to press them in. If they want $50-$75+, I'm just going to try the freezing method. Now if they tell me $10-$20. then I'm going to have them press the bushings in there. I wish I would have known this freezing trick before-hand. Kicking myself in the butt for that one.
  5. dieselss

    dieselss LawnSite Silver Member
    Messages: 2,066

    Heating aluminum to about 100-150 ain't bad
    Posted via Mobile Device
  6. Patriot Services

    Patriot Services LawnSite Fanatic
    Messages: 14,356

    Make triple sure you have the right bushings and run a deburring scraper around the edge. Dress the bushing edge with cloth or stone as well. A microscopic burr can cause a hang up as well.
    Posted via Mobile Device
  7. larryinalabama

    larryinalabama LawnSite Fanatic
    Messages: 19,478

    You could stick it under a hot water Fawcett for a few minutes, Ive done that with bunch of pistons.

    As far as that bushing, take it to a machine shop and bring the crank. They usually charge me around 60 to install camshaft bearings on a V8 so expect to pay at least 30 to 40$.
  8. Tcartwri

    Tcartwri LawnSite Member
    Messages: 30

    The oil in your crankcase runs at 200F...
    Posted via Mobile Device
  9. ricky86

    ricky86 LawnSite Silver Member
    Messages: 2,122

    MolyLube will help after freezing. You replacing the crank also? There was a time period that KMC had a problems with the main journal finish. New bushings won't fix it. One word of caution, do not hammer them in. Use a press or make up a puller/pusher.
  10. PicturePerfectLawns

    PicturePerfectLawns LawnSite Gold Member
    Messages: 3,845

    I appreciate all the feed back from you guys. Like I said, I'm going to try a machine shop down the road and see what they say. I'd rather have them just push them in with a press if they can do it the same day, I'm in a hurry now and need this machine up and going. If they want too much or can't do it the same day, I'll be trying the methods above. Ricky, I'm not going to change the crank. When I opened it up everything was close to spec, the crank didn't have much play in it at all despite the problems Kawasaki was having with the upper crank/block bushings in 05 when this one was built. All the bushings came in the kit, so I figure I might as well replace it all while it's apart. I'm not changing the crank or cam considering they were close. I'm replacing all of the following; case cover gasket, valve cover gasket, piston rings, block crank seal, block cover seal, intake gaskets, exhaust gaskets, valve guide seals, flywheel key, governor shaft seal, breather gasket, carb. gasket, and crankshaft bushings. Also did the valves, cleaned the fuel tank and carb. before putting in the new gaskets, changing the air filter and fuel filter, will be breaking in with oil change at 10-30-50 hours and then switching to synthetic!

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