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  1. #1
    RC poster
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    3.3 engine head screw hole stripped

    The hole for one of the engine cooling head screws in my 3.3 is stripped, and it causes a massive air leak. Is there anything I can do or do I have to replace the entire engine from one screw? I don't exactly have 120+$ burning a hole in my pocket for. Anew engine via power up.

  2. #2
    RC Qualifier nebulous.cow's Avatar
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    Bummer man. Those screws are pretty important. Don't run the engine with only 4/5 screws tightened down though, it can permanently warp the parts.

    As long as you can take it all apart again, you can replace just the block. OR, if you're really adventurous and handy with tools, you could drill out the stripped hole and install a helicoil in there. Look them up, they are awesome for fixing stripped screws.

    Either way, the crank case block isn't 120 bucks, so it's better than nothing. Don't tighten the head bolts that much, i wouldn't even use a t wrench or anything with leverage, it has 5 bolts holding the head on, equally snug them down together in the star pattern, no cranking on them.

    Hope this helps.
    -Mike

  3. #3
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    Can I just replace the crankcase or do I have to replace the whole thing? Because if I have to replace the piston and sleeve as well than I'd rather not, because at that point I'd rather just get a new engine.

  4. #4
    RC Champion grizzly03's Avatar
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    You only need to replace the crankcase. You would install all your parts (except for crankcase) on the new crankcase, with nothing more needed.

  5. #5
    RC Champion olds97_lss's Avatar
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    You can usually snag them off ebay with the bearings installed pretty cheap, or you used to be able to.

    $40 with bearings, backplate, starter shaft, carb cinch bolt, o-rings: https://www.ebay.com/itm/NEW-T-MAXX-...5/114191777649

    $32.50 for just the crank case: https://www.ebay.com/itm/NIP-Traxxas...o/223337805178

    I'd spend the $40 so you don't have to fiddle with the bearings/o-rings.
    https://www.youtube.com/c/olds97lss

  6. #6
    RC Racer
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    Quote Originally Posted by olds97_lss View Post
    You can usually snag them off ebay with the bearings installed pretty cheap, or you used to be able to.

    $40 with bearings, backplate, starter shaft, carb cinch bolt, o-rings: https://www.ebay.com/itm/NEW-T-MAXX-...5/114191777649

    $32.50 for just the crank case: https://www.ebay.com/itm/NIP-Traxxas...o/223337805178

    I'd spend the $40 so you don't have to fiddle with the bearings/o-rings.
    I'm about to replace the worn bearings on my pro 15. Is it really that hard to get them in and out? I got them out rather easily.
    I'm not afraid of my fellow man.

  7. #7
    Marshal Double G's Avatar
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    Heat the oven to 350. Remove all plastic and rubber parts. Put in oven for about 10 minutes. Carefully remove, hit the back of the engine on a piece of wood and the rear bearing should fall right out. The front should as well but if not then use a socket small enough to fit through the bore of the crankcase but large enough to push the bearing.
    Cooling the bearings in a freezer will aid in getting them in. Don't put freezing bearings in a hot block. Just make sure they are fully seated.
    The Super Derecho

  8. #8
    RC Champion olds97_lss's Avatar
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    Quote Originally Posted by TruckerTucker View Post
    I'm about to replace the worn bearings on my pro 15. Is it really that hard to get them in and out? I got them out rather easily.
    Sometimes they can be very stubborn. I've done what DoubleG mentioned before out of necessity as I couldn't get the bearings to come out and I didn't want to scratch up the crank case as I was just replacing the bearings. I just used a toaster oven and one of those kevlar cooking gloves, pulled the engine out and tapped the back of the crank case on a 2x6 I had and the rear bearing fell out.
    https://www.youtube.com/c/olds97lss

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