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1950 JD B Engine Compression

A

Ayr Time

Member
What was the new engine
compression rating on the
1950 JD B? I've performed
various searches to no
avail.
I'm getting readings of
around 90 PSI, max 95 and
min 85. Cylinders are
within 5psi of each
other. These readings on
a B that Sat outside,
dormant for over 16 years
and wasn't stuck!

Thanks,
Richard in E. Ontario
 
Those readings sound good for an old one that was setting. IIRC 125 psi would be one in top condition.
 
Thanks Mike M for that information and the vote of confidence!! I am surprised that the "new engine" compression would be as high as 125 psi!
Needless to say I was thrilled that the compression readings were so close at 5psi differential.
I've had the B running and several times and running very well. It recently hickupped and quit. Timing is right on and spark is strong. I've just obtained the #40 and #53 aircraft drill bits and will clean out the DLTX 67 "secret" passages next.
Hoping a clogged passage is the issue. It was stumbling on throttle up.
3 years ago when I first began the B restoration, I had installed a carburetor kit, but perhaps missed cleaning one of the passages.
Thanks again. Richard
 
(quoted from post at 10:45:10 12/03/18) What was the new engine
compression rating on the
1950 JD B? I've performed
various searches to no
avail.
I'm getting readings of
around 90 PSI, max 95 and
min 85. Cylinders are
within 5psi of each
other. These readings on
a B that Sat outside,
dormant for over 16 years
and wasn't stuck!

Thanks,
Richard in E. Ontario
Click to expand...

If rebuilding and burning kerosene is not in your plans . A set of 50 LP pistons bolt right in and will perk her up considerably.
 
Yes thanks again Mike M.
When I worked on this carburetor 3 years ago I almost missed the that main nozzle! On advice secured here on YTF, I drilled and tapped the main nozzle and was able to pop it loose!

Now that I have the aircraft drill bits #40 and #53, I want to make sure I locate and clean all of the "secret" passages on this DLTX 67.

Cheers, Richard
 
You will also need a # 58 bit and knock out those two brass plugs in back side straight across from the 4 tiny bore pin ports. two fuel and two air. They need drilled to size. Even if you can slip a tiny torch tip cleaner in them...they need to be correct size. You can get the bits lot cheaper at a site called "Drills & Cutters.com Stumble on throttle - up is usually a load circuit issue. If nozzle is clean, make sure ou got it pushed back up in throttle bore far enough. Sometimes they stub on the top and need beveled and drove in to seat all the way. Should protrude into bore abt 3/8" or so. If not it will hesitate or stall when throttling up. Good luck with it.
 

Thanks for your input Randy B(Mi)
#58 drill bit is proving to be a little more challenging to obtain than the #40 and #54 I was able to source here in Canada, although one source indicates a 2 week order time, and that was from Florida.
I checked with Drills and Cutters.com and with US/CDN exchange the bit gets rather pricey.

What do you use to plug the brass plugs that you remove?

Yes the main nozzle was protruding about 3/8" into the bore before I disassembled it.

I greatly appreciate all of the input and support I have received from this wonderful forum!
Thank you, Richard
 

Thanks for the suggestion on the LP 50 pistons.
No, Kerosine in the plans here. I must investigate LP 50 pistons as a possibilty. I'm not a mechanic, but am up to the challenge!
I do have a couple of JD friends in the area, one of whom is a heavy machine mechanic.

Richard
 
If you are careful pounding them out with the correct sized drill bit shank , you can use them over. You can get them from Marks Carb in Rice , MN also.
 
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