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Old 01-13-2004, 10:39 PM   #1
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Default My flywheel is coming loose help.

OK I am driving my Nitro RS4 3 Type SS and it dies with a 1/4 tank left, so I take it home and try to start it with my drill(is this bad)(I broke 3 pullstarts and currently don't have cash for a starterbox, new backplate, and new mounts) and notice the flywheel spinning when I let the trigger go and so I take apart the whole thing and rebuild it (with fresh threadlock and I donno if this is bad or not but cleaned the old threadlock off with acrylic Laquer thinner) and about 2 hrs later I put it back on the chasiss and start it it runs for about 3 minutes and I floor it and it dies, the flywheel is loose again, what can I do?
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Old 01-14-2004, 08:54 AM   #2
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what do you mean by the flywheel is loose??
you mean the piston won't go up and down if you turn the flywheel?

if the flywheel is loose then engine will spool up without the car moving, if the engine dies when you apply throttle it is more like a tuning problem
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Old 01-14-2004, 09:02 AM   #3
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You didn't say what engine your using. More importantly, what type of shaft it has.

-If its a SG-shaft and the clutch nut is still allowing the flywheel to come loose, you may just need stronger thread lock and better tightening of the clutch nut.

-If on the other hand its a threaded shaft, you may not have cut it short enough to allow the clutch nut to fully tighten down on the flywheel.

Some tips, use a high quality 4 way wrence to tighten the clutch nut(so you wont have to fear of stripping it). And also, get some channel lock plyers(or one of the specific tools on the market like the one from OFNA) to hold the flywheel while your tightening the clutch nut. Holding it in your hand with a rag isn't going to do it.

Oh, and make sure your using the proper collet for your car/engine and make sure it isn't damaged or allowing the flywheel to completely pass over it.
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Old 01-14-2004, 11:40 AM   #4
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THe simple fix is to tighten the flywheel, ive seen this happen dozens of times with HPI rtr kits, as well as others,the flywheel tends to loosen itself during break in, tighten it back up and you wont have a problem.
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Old 01-14-2004, 03:23 PM   #5
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ok thanks guys here is a pic of the flywheel with the collet in it is this what it is supposed to look like? or should the collet be flush with the FW? (BTW I have a nitro RS4 3 Type SS with the .12 R SS engine had if for about 6 months)
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Old 01-14-2004, 04:15 PM   #6
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No, thats pretty much how it should look. The flywheel shouldn't completely come over the collet on the HPI kit. So my guess would be that you simply aren't getting it tight enough.

Look at what I said before and try tightening it again. The shafts on most Nitro engines are hardened, so you don't have much to fear from over tightening it and breaking the shaft. Use the channel lock plyers or flywheel holding tool, and really crank it down with a 4 way clutch nut wrench.

That should solve it.
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Old 01-14-2004, 04:23 PM   #7
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ok I will try that
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Old 01-14-2004, 04:37 PM   #8
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Good luck...
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Old 01-16-2004, 02:46 PM   #9
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Try a drop of blue LokTite, the flywheel does'nt have to be that tight, and it will break if tightened too tight.
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Old 01-16-2004, 03:00 PM   #10
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Get a piston locking tool and a glo plug wrench and 2 drops of blue automotive locktite. that bad boy wont back off again.
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Old 01-16-2004, 06:22 PM   #11
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Quote:
Originally posted by Smoke21
ok thanks guys here is a pic of the flywheel with the collet in it is this what it is supposed to look like? or should the collet be flush with the FW? (BTW I have a nitro RS4 3 Type SS with the .12 R SS engine had if for about 6 months)
what kind of flywheel is it? and it looks like a plastic molded one. I remember HPI engine collet is made of copper one instead.
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