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Cox Engine of The Month
Cox .051 Tee Dee cranksaft removal and replacement
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Cox .051 Tee Dee cranksaft removal and replacement
Hi,
Can anyone explain how to remove and replace crank on a .051 TD?
I want to put in a killer bee crank or replace with original part.
Cheers!
coxxoc
Can anyone explain how to remove and replace crank on a .051 TD?
I want to put in a killer bee crank or replace with original part.
Cheers!
coxxoc
coxxoc- Gold Member
- Posts : 115
Join date : 2012-05-03
Age : 63
Location : Australia
Re: Cox .051 Tee Dee cranksaft removal and replacement
The Killer Bee crank will not work on a TD. The KB crank is designed for reed valve engines; The TD's are hollow with an induction port about midway down the shaft. Finding a new original TD crank may prove to be a little difficult. Some of the posters on this forum may have one they would part with or know of another source. I did not see a TD crank on either the COX International or EX Model Engines sites. If neither Matt nor Bernie have them stocked, you'll have to do some searching.
If your crank is not damaged or worn, I would not be inclined to replace it.
andrew
If your crank is not damaged or worn, I would not be inclined to replace it.
andrew
Cox .051 Tee Dee cranksaft removal and replacement
To remove the crank from a Tee Dee, you must remove the backplate. I usually take a marker and mark the con rod so that when I'm reinstalling it I have it on the same way it was originally on the crank pin. This may or may not even matter just something I do. I remove the cylinder and take out the piston. I screw the cylinder hand tight back into the case. I use this to hold onto. Using the proper wrench for the Tee Dee, the one with the pin spanner unscrew the lock ring that holds the carb body on. This will force the drive plate off of the crank. Be careful not to lose the drive washer which could either be phenolic or stainless steel. It can easily fall off or be glued to the drive plate on the back of it. Unfortunately, the Killer Bee crank won't fit or work in the Tee Dee as that crank is designed for a reed valve engine. Is the original crank broken? Now is a good time to check the ball socket fit of the piston and reset if needed. Reassembling is just a matter of reversal of operations. Although putting the drive plate back on the crank can be problematic. They do make a tool for this although I made my own. I line the splines of the drive plate back onto the crank. I have a 5-40 allen screw which has a nut threaded onto it and I have a spacer with a washer placed against the drive plate. I screw allen screw into the crank until it bottoms then I proceed to back the nut and washer back into the drive plate. This presses the drive plate back onto the crank squarely. It can be very easy to place the drive plate on crooked. Ken
Ken Cook- Top Poster
- Posts : 5461
Join date : 2012-03-27
Location : pennsylvania
Re: Cox .051 Tee Dee cranksaft removal and replacement
That's a Medallion crank.
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Re: Cox .051 Tee Dee cranksaft removal and replacement
Below are our carb body installation instructions but they apply equally to the crank:
Carburetor body installation
• Unscrew needle valve
• Unscrew venturi
• Remove needle valve body & spring
• Remove backplate
• Remove cylinder
• Remove piston
• Stand crankcase upright, drive-plate facing upwards
• Insert prop screw as deep as possible
• Tap with hammer until drive-plate separates from crank
• Unscrew collet
• Wedge flat object between carb body and crankcase and twist. Use a plastic or wooden object and not a metal one to prevent scratches – A med-sized flat screwdriver with the tip taped over for instance is an option. (Carb body is pressed on, not screwed)
• Press in new carb body
• Re-assemble engine
For ease of dis-assembly / assembly we sell the following tools:
• Wrench
• Dis-assembly tool
• Assembly tool
Carburetor body installation
• Unscrew needle valve
• Unscrew venturi
• Remove needle valve body & spring
• Remove backplate
• Remove cylinder
• Remove piston
• Stand crankcase upright, drive-plate facing upwards
• Insert prop screw as deep as possible
• Tap with hammer until drive-plate separates from crank
• Unscrew collet
• Wedge flat object between carb body and crankcase and twist. Use a plastic or wooden object and not a metal one to prevent scratches – A med-sized flat screwdriver with the tip taped over for instance is an option. (Carb body is pressed on, not screwed)
• Press in new carb body
• Re-assemble engine
For ease of dis-assembly / assembly we sell the following tools:
• Wrench
• Dis-assembly tool
• Assembly tool
Re: Cox .051 Tee Dee cranksaft removal and replacement
RknRusty wrote:That's a Medallion crank.
What's the difference?
Re: Cox .051 Tee Dee cranksaft removal and replacement
The TD crank has more aggressive porting.
Last edited by Cox International on Thu May 03, 2012 11:32 am; edited 1 time in total (Reason for editing : Typo)
Re: Cox .051 Tee Dee cranksaft removal and replacement
Medallions have a small round crankmicroflitedude wrote:RknRusty wrote:That's a Medallion crank.
What's the difference?
Intake and tee dees have a large rectangular one.
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