OS CV-15 engine NO COMPRESSION on pull start

[GT Grand Prix 00]

I have an OS CV-15 with pull start that has no compression with the pull start
system. I pulled the start system off of the motor and everything looks fine. I
pulled the glow plug and the piston does not move up and down with every pull
of the cord. The piston will move normally about every 4th or 5th pull. The
engine is fine if you manually turn the flywheel, and the engine runs fine when
it does start. I'm lost for ideas.

George
Tampa

[MikeF]

Bad one way bearing in the starter.
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXSS33&P=Z
Its the #1 problem that pullstarts have. Ive only ever broken about 2 ropes, but maybe 5
oneways.


"GT Grand Prix 00" <gtgrandprix00@aol.com> wrote in message
news:20040104135416.26239.00002436@mb-m06.aol.com...
> I have an OS CV-15 with pull start that has no compression with the pull start
> system. I pulled the start system off of the motor and everything looks fine. I
> pulled the glow plug and the piston does not move up and down with every pull
> of the cord. The piston will move normally about every 4th or 5th pull. The
> engine is fine if you manually turn the flywheel, and the engine runs fine when
> it does start. I'm lost for ideas.
>
> George
> Tampa

[GT Grand Prix 00]

Update...I cleaned tghe bearing as the first post suggested, and it worked for
about 10 pulls. What causes these bearing to go bad? The local hobby shop said
that you couldn't get the bearing seperate, but once again tower Hobbies saves
the world. Thanks for the link

[Chris Dugan]

"GT Grand Prix 00" <gtgrandprix00@aol.com> wrote in message
news:20040105212033.10976.00001355@mb-m24.aol.com...
> Update...I cleaned tghe bearing as the first post suggested, and it worked
for
> about 10 pulls. What causes these bearing to go bad? The local hobby shop
said
> that you couldn't get the bearing seperate, but once again tower Hobbies
saves
> the world. Thanks for the link

The oil in the fuel causes the bearing to slip more than it should. Ideally
the inside of the pullstart should be dry and so should the shaft that the
one-way bearing sits on. You might find that the backplate seal on the
engine or crankshaft seal (if present) are leaking and letting fuel/oil into
the pull start. The nearest easily available correct oil for a one-way
bearing is automatic transmission fluid, just a small drop after cleaning
the bearing out with motor spray and letting it dry out first.

When running nitro cars in the wet with a 2 speed gearbox the one way can
slip more than usual... it gets hot, expands and then slips some more, etc,
etc. vicious circle until you get no drive. A quick pitstop and douse the
gearbox with a drop of nitro fuel will cool and re-lubricate the bearing
letting it grip again until the next fuel stop.

Chris


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[GT Grand Prix 00]

I did replace the backplate gasket. After i cleaned the bearing, it worked for
a little while until the engine was hot, then it stopped working again. I
pulled the truck out today and it started first pull. Once again it worked
until the engine got hot. Will the engine shut off once it is hot and the
bearing decides to quit for the day? i have noticed that in the last 2 days,
after about 2 tanks, the engine shuts off and the bearing quits. Is there a
permanent fix for the pull system?

George

[GT Grand Prix 00]

where can I get the yank eliminator? The bearing finally took a final crap..lol

[Chris Dugan]

"GT Grand Prix 00" <gtgrandprix00@aol.com> wrote in message
news:20040109214945.23083.00001886@mb-m27.aol.com...
> where can I get the yank eliminator? The bearing finally took a final
crap..lol

I think that Tower should stock one, I've never had to buy one as all my
nitro cars have used a starterbox. Also being in the UK I don't know the
best places for you to buy them so I usually start at Tower and then do a
Google for any other sites here's Towers offering:

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXSN77&P=7

I'm sure other people on here have their own suppliers maybe at better
prices.

Chris


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[MikeF]

BTW, the yank eliminator uses its own one-way. But since its not mounted to the engine, it
may last longer. Just be sure to wipe clean the shaft before you try to start.


"Chris Dugan" <chrisdotdugan@bloodyobvious.co.uk> wrote in message
news:_GQLb.101$YV1.86@newsfep4-winn.server.ntli.net...
> "GT Grand Prix 00" <gtgrandprix00@aol.com> wrote in message
> news:20040109214945.23083.00001886@mb-m27.aol.com...
> > where can I get the yank eliminator? The bearing finally took a final
> crap..lol
>
> I think that Tower should stock one, I've never had to buy one as all my
> nitro cars have used a starterbox. Also being in the UK I don't know the
> best places for you to buy them so I usually start at Tower and then do a
> Google for any other sites here's Towers offering:
>
> http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXSN77&P=7
>
> I'm sure other people on here have their own suppliers maybe at better
> prices.
>
> Chris
>
>
> ---
> Outgoing mail is certified Virus Free.
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>
>