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Old 01-26-2008, 10:54 PM   #1
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Default Only 3 Screws on engine backplate

Crap, I just broke in my Novarossi RX21P5T and while disassembling it, i broke one of the screw that holds the backplate! The thread is stuck in the crankcase, can anyone suggest how to get it out? Also, is it ok to run with just 3 screws securing the backplate? Thanks guys!

p/s: italian engines are getting overrated

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Old 01-27-2008, 06:52 AM   #2
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drill a hole in the screw and put a screw extractor in it and pull it out. if it is really stuck, heat the engine up first with a heat gun
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Old 01-27-2008, 07:13 AM   #3
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drill a hole in the screw and put a screw extractor in it and pull it out. if it is really stuck, heat the engine up first with a heat gun
hmm...."screw extractor"....I have yet to see nor heard of such tool before Anyway I'll ask the hardware store. Thanks mate!
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Old 01-27-2008, 07:24 AM   #4
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hmm...."screw extractor"....I have yet to see nor heard of such tool before Anyway I'll ask the hardware store. Thanks mate!
looks somewhat similar to a tap but without the treads. you drill the hole in the screw like he said and then you tap the extractor into the hole lightly with a hammer and then you turn that as an extension of the screw. must be very very careful with both the drilling and the extracting at that small of a scale screw tho. if it was me i would just run 3 screws and rtv around the seal and just check the 3 screws frequently. but again thats just me...i dont have the patience for trying to get a screw out that small
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Old 01-27-2008, 07:31 AM   #5
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looks somewhat similar to a tap but without the treads. you drill the hole in the screw like he said and then you tap the extractor into the hole lightly with a hammer and then you turn that as an extension of the screw. must be very very careful with both the drilling and the extracting at that small of a scale screw tho. if it was me i would just run 3 screws and rtv around the seal and just check the 3 screws frequently. but again thats just me...i dont have the patience for trying to get a screw out that small
Thanks man, I did a search on google just minutes ago. There was a time I had a broken kingpin with it's thred stuck in the knuckle, it was easy to do since it's 4mm in diameter. What I did was used the smallest dremel bit and cut a slot, and used a flat head screw driver to take it out. Now it's 2.5mm.... Not too sure about that. ANyway, do you guys seal up your engine? I have the itch to seal the backplate with 2 part epoxy
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Old 01-27-2008, 08:01 AM   #6
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use some high temp RTV seal. its a rubber gasket material.
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Old 01-27-2008, 08:57 AM   #7
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. ANyway, do you guys seal up your engine? I have the itch to seal the backplate with 2 part epoxy
.........Permatex Ultra Copper...is oxygen sensor safe......will not cause corrosion in engine.......
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Old 01-27-2008, 11:48 AM   #8
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no you cant run with 3 screws
if its sticking out far enough you can try and use pliers to get it out
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Old 01-28-2008, 05:02 PM   #9
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If you got the screw out, I have replacements.

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Old 01-28-2008, 11:31 PM   #10
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I had a nova plus 21-5T that came with a bad set of screws in the backplate, I snaped one off and ran it with three screw for about 2 months of racing, never had a problem. Then another one snapped!! so I only had two opposite corner screws holding on the backplate, believe it or not, I ran it like that for the remainder of the season without a single issue, no seal or nothing. So I say run it . There are some weak screws out there, I wasnt cranking them down extremeley tight either, just snug then another quarter turn. Ive owned many nova's in the past and had never had an issue with broken screws untill this one, just a bad batch of screws.
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Old 01-28-2008, 11:59 PM   #11
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I had a nova plus 21-5T that came with a bad set of screws in the backplate, I snaped one off and ran it with three screw for about 2 months of racing, never had a problem. Then another one snapped!! so I only had two opposite corner screws holding on the backplate, believe it or not, I ran it like that for the remainder of the season without a single issue, no seal or nothing. So I say run it . There are some weak screws out there, I wasnt cranking them down extremeley tight either, just snug then another quarter turn. Ive owned many nova's in the past and had never had an issue with broken screws untill this one, just a bad batch of screws.
Wow! That's awesome! Of course, i can't stop from being a paranoid that the uneven force distributed at the backplate actually affects the performance. Yeah, I think we got the bad batch man....I was really shocked that this could happen to a reputable engine Again, being able to run for the number of seasons you mentioned seems spectacular

TonyScrews, thanks for your offer, i highly appreciate your attention
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Old 01-29-2008, 12:08 AM   #12
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If you got the screw out, I have replacements.

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