R/C Repair

  1. Login
  2. Sign Up
  1. Article List

K&B .40 Rebuild

     This K&B .40 cubic inch engine was removed from a Carl Goldberg Eagle 63 model airplane.  The engine was seized, it would not turn over.  The plan is to rebuild the engine, bench check and set the mixture controls for proper running and put it back in the Eagle.

Image not available

K&B .40

Image not available

Prior to any cleaning

Image not available

     This engine has the large K&B square carb with K/B engraved on the front. This style carb was used on the 40 R/C #4011 up to approximately 1988 according to the Model Engine Corporation of America, mecoa, web page at http://www.mecoa.com/kb/40/40-parts.htm

K/B Carb

Image not available

Used on the K&B .40 up to 1988

Rebuild

Disassembly Notes

Image not available

Top View and with the head off. I've never see a poston like this one.

Image not available

Almost completly disassembled

Image not available

I had a hard time getting the crankshaft out of the housing. I tried using heat with a heat gun, using lacquer thinner to remove the built up castor, and penetrating oil. I ended up pressing the crankshaft out using a vise and wooden blocks.

Image not available

All parts except the bearing have been removed. I had to heat the case and use a wooden popsicle stick to push out the piston liner. I also removed the front bearing by heating the case and it fell out. After cleaning and oiling, it was reinstalled. Both bearings seemed to be smooth

Image not available

The rebuilt engine ready to be bench checked and installed in the Eagle.

Image not available

Reader Comments


This page has been served 458 times.
Last update: 10/31/2023

Copyright © 2018-2024  M. Rotherforth.      All rights reserved.      E-mail Webmaster
Valid HTML 4.01 Transitional