Go Back  RCU Forums > RC Airplanes > RC Scale Aircraft
Reload this Page >

A bit of help/4 Stroke....what did I Do?

Notices
RC Scale Aircraft Discuss rc scale aircraft here (for giant scale see category above)

A bit of help/4 Stroke....what did I Do?

Old 09-28-2007, 07:12 PM
  #1  
ZoomZoom-RCU
Senior Member
Thread Starter
 
ZoomZoom-RCU's Avatar
 
Join Date: Jun 2002
Location: Louisa, VA
Posts: 790
Likes: 0
Received 0 Likes on 0 Posts
Default A bit of help/4 Stroke....what did I Do?

This is for all of you folks who have some experience with 4 strokes. I was just recently geraing up to test run my new out of the box Magnum 52 4 -stroke engine. Got everything ready, installed the prop, then noticed some stiffness when trying to rotate the prop. I thought this odd on a brand new motor, so I backed off and slowly tried to complete a revolution again. This culminated in the prop getting very tight as I tried to rotate it, then a sharp popping sound and it spinning free. No fuel lines were connected this was just a dry run so there was no hydro lock involved. Well, needless to say by this point I was concerned and removed the header, only to find one of the valves stuck....very stuck....compressed down onto its lifter spring and not moving. Long story short, some gentle persuasion with a small screwdriver after applying some lubricant, eventually freed the little #$%@#, and now both of them operate properly and freely....rocking away to their little hearts content as I spin the prop. Now my question....could turning this thing over with a valve stuck as it was, have damaged it? Im a bit concerned even though everything seems to be operating correctly now. I'm getting ready to bench run it tomorrow, but was wondering if there is anything I should be concerned about...or look for? Thanks to all for any assistance.....I could send it in for repair/inspection....but if you guys think there is little chance of real harm having been done, I will run her.

ZZ.
Old 09-28-2007, 09:59 PM
  #2  
Wayne22
My Feedback: (2)
 
Wayne22's Avatar
 
Join Date: Apr 2002
Location: Strathcona county, AB, CANADA
Posts: 5,392
Received 0 Likes on 0 Posts
Default RE: A bit of help/4 Stroke....what did I Do?

it sounds like the piston was hitting the valve which could bend the valve stem. If you still have the new engine waranty, sent it back.

Old 09-29-2007, 08:00 AM
  #3  
ZoomZoom-RCU
Senior Member
Thread Starter
 
ZoomZoom-RCU's Avatar
 
Join Date: Jun 2002
Location: Louisa, VA
Posts: 790
Likes: 0
Received 0 Likes on 0 Posts
Default RE: A bit of help/4 Stroke....what did I Do?

Thats what I was afraid of. I'll see if I can return it for service.

Thanks

ZZ.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.