Used Engine Advice-Try running or clean first?

Discuss anything R/C related that does not fit into any other forum.

Moderator: Moderators

Post Reply
Jordo
Savage Enthusiast
Savage Enthusiast
Posts: 240
Joined: Mon Nov 02, 2009 12:00 am
Location: ND

Used Engine Advice-Try running or clean first?

Post by Jordo » Sun Mar 06, 2016 10:22 pm

Picked up a used traxxas revo 3.3. It came missing the exhaust system and air filter. Motor looks like it's been sitting a long time. I'm wondering if I should just put on the missing parts and run it, or should I disassemble the motor and give it a good cleaning?


Image

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar
Dyehard
Savage Superstar
Savage Superstar
Posts: 338
Joined: Sun Aug 01, 2004 11:00 pm

Post by Dyehard » Sun Mar 06, 2016 10:54 pm

I would take it apart and clean it first, With the air filter being gone you don't know what is inside it... Better safe than sorry...
Savage#1 flm lcg ext tvp\'s sts.28, fullforce towers, mid-tank,zombies,UE super shocks
Savage #2 Full Force carbon fiber chassis, bpdiffs,wing, cvd's V-Spec, mid-tank
Savage #3 Flux with?????????????
If it ain't broke go faster and jump higher!!!!

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar
Squid
Site Admin
Site Admin
Posts: 7153
Joined: Sat Aug 23, 2003 11:00 pm
Location: Upstate NY
Contact:

Post by Squid » Mon Mar 07, 2016 1:37 am

I agree with Dyehard. I would at the minimum pull the head and backplate, flush it out with motor spray and if all looks good, lube it with some Marvel Mystery Oil.
Not knowing how it had been used or how much, I would look closely at the lower conrod bearing, and see if it needs a new rod. Also, you can check the pinch, and cylinder walls.

Link:
BBcode:
HTML:
Hide post links
Show post links

Jordo
Savage Enthusiast
Savage Enthusiast
Posts: 240
Joined: Mon Nov 02, 2009 12:00 am
Location: ND

Post by Jordo » Mon Mar 07, 2016 9:00 am

Thanks for the input guys. I'll tear it apart and check it out.

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar
Squid
Site Admin
Site Admin
Posts: 7153
Joined: Sat Aug 23, 2003 11:00 pm
Location: Upstate NY
Contact:

Post by Squid » Fri Mar 11, 2016 10:56 pm

Have you gotten to open up the engine yet? If so, how did it look?

Link:
BBcode:
HTML:
Hide post links
Show post links

Jordo
Savage Enthusiast
Savage Enthusiast
Posts: 240
Joined: Mon Nov 02, 2009 12:00 am
Location: ND

Post by Jordo » Sat Mar 12, 2016 11:00 am

No I haven't opened it up yet. I've been waiting for it to warm up a bit outside first. I'll post the findings after I tear it apart. I plan on cleaning up the truck and selling it. It came as a package deal with a savage 4.6 I bought.

Link:
BBcode:
HTML:
Hide post links
Show post links

Jordo
Savage Enthusiast
Savage Enthusiast
Posts: 240
Joined: Mon Nov 02, 2009 12:00 am
Location: ND

Post by Jordo » Sun Mar 13, 2016 5:24 pm

I took it apart someone made a mess of it but I think it should clean up well. No scoring on the piston or sleeve and the rod fit well on the crank pin. What's an easy way to clean everything off, brake clean?

Image

Image

Image

Image

Image

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar
Squid
Site Admin
Site Admin
Posts: 7153
Joined: Sat Aug 23, 2003 11:00 pm
Location: Upstate NY
Contact:

Post by Squid » Sun Mar 13, 2016 11:27 pm

Wow! Someone went a bit overboard with the RTV. That should just scrape off fairly easily, Brake Clean should get the rest off. Just remember to lube everything before you reassemble. I prefer Marvel Mystery oil for assembly lube.
I'd take a good look at the head gaskets, with that much RTV there they may be damaged. Or the previous owner was just doing a preventative seal.

Link:
BBcode:
HTML:
Hide post links
Show post links

Post Reply

Who is online

Users browsing this forum: No registered users and 9 guests