Bad compression

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Don McCombs
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Re: Bad compression

Postby Don McCombs » Fri Dec 23, 2016 4:39 pm

Lacquer thinner will work well, also.
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Rob in NH
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Re: Bad compression

Postby Rob in NH » Fri Dec 23, 2016 5:02 pm

i heat it up then blow it out with the air gun.
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Glen
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Re: Bad compression

Postby Glen » Fri Dec 23, 2016 8:10 pm

Hi,
Nice that you got the engine back, looks good.
If you are putting the rest of it together yourself, look and see if the 5 little plugs in the oil passages in the block are there. They could have been removed for boiling out the block. If one or more are left out, it will probably have no oil pressure when running.
Here are pics below, one plug is under the front cover, above and to the left of the camshaft hole.
One is under the valve cover, by the rear bolt hole for the bolt that holds the cover on.
One is in the middle of the 2nd pic, on the outside of the block.
One is on top of the block, by the oil filter cover.
One is on the left rear edge of the block, it is under the Touch Control tubes, when assembled.
I'm not sure if that is another plug to the lower left of the idler gear bolt, under the front cover, maybe someone knows.
If there are others, maybe someone will write it.
The pics are from TM Tractor. :)
Attachments
Cub Block 1.jpg
Cub Block 2.jpg
Cub Block 3.jpg

ParlowMillFarm
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Re: Bad compression

Postby ParlowMillFarm » Fri Dec 23, 2016 8:58 pm

Thanks Glen,

I will check.

John

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Re: Bad compression

Postby ParlowMillFarm » Tue Dec 27, 2016 12:03 pm

Bob,

Thanks again for the tip on the carb cleaner - worked wonders.

Glen - I checked the plugs, they are all in place.

I'm waiting on my new torque wrench, and will put in the pilot bearing while I'm waiting on it. Take a look at the old one next to the new one. The old one is shorter and worn down to a sharp edge at the leading edge.

Sort of funny wear pattern. Is this after what happens after 69 years? or is this indicative of something else?
Old-new_pilot _bearing.JPG
old and new pilot bearings


John

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Re: Bad compression

Postby Glen » Tue Dec 27, 2016 8:56 pm

Hi,
Good that the oil passage plugs are there.
I haven't seen a pilot bushing worn like that. It looks like it has been worn into by the shaft, where it changes to the bigger size. The bushing should be only on the smaller part of the shaft, at the front end. Look at the surface the pilot bushing runs on, on the shaft and be sure it looks good.
Measure the length of the new pilot bushing, and then measure into the hole in the crankshaft, and see if it is drilled deep enough for the bushing to fit in to the proper position.
Below is a picture of the end of the shaft from TM Tractor.
You could try the new bushing on the shaft, and see if it fits good.
Boss Hog has said that some of the new pilot bushings are too small an inner diameter when installed in the hole for it, so when you run the Cub, the long clutch shaft keeps turning, and the gears grind when trying to put it in gear. So watch out for that too. Measure the ID when the bushing is installed, and see if it is ok, there are size specs in the service manual. It will need reaming out if it is too small. Some of the guys have said they used a wood dowel with sandpaper wrapped around it.
Below is the page with the specs, from GSS-1411, you need a dial caliper that will measure ID. I don't know if you have one. It says .004 - .006 inch running clearance.
Measure the end of the shaft too, it has a spec for that.
Here is a post about adjusting the pressure plate finger height, they are set when the plate and disc are assembled on the flywheel. That has to be right too. Set them so all 3 fingers are the same height, and make a flat surface for the throwout bearing to run on. The pics are helpful. :)

http://farmallcub.com/phpBB2/viewtopic.php?t=6994

http://www.farmallcub.info/manuals/gss- ... 005-02.jpg
Attachments
Cub shaft.jpg

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Re: Bad compression

Postby outdoors4evr » Wed Jan 04, 2017 8:21 am

Check the end of your driveshaft. It may have a burr at the shoulder where the pilot bushing rides (see the middle of the picture Glen posted). If there is a burr, it will grind away at the pilot bushing. File down any irregularities.
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Re: Bad compression

Postby ParlowMillFarm » Sun Jan 15, 2017 5:34 pm

So I have the tractor back together and rewired. So far so good.

Put the hood on and connected the gas. Left the gas shut off at end of day as I ran out of time.

Came out today noticed a slight drip.

The fuel line is rubber (or something like it) and was wet, sorta weeping - so its time to replace with a steel line.'
'
The cork gasket in the fuel bowl was really disintegrated, there was no screen, and the gas was slowly leaking out of the valve at the stem.

Startup testing and break-in has been slightly delayed.

(also put a charger on the battery and the % charge stopped climbing at 84%. Enough for a compression test.)

John

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Re: Bad compression

Postby Glen » Sun Jan 15, 2017 6:30 pm

Hi,
Good that you have it back together.
At your last post, you were working on the pilot bushing, guess you checked it's ID after installing it to be sure it is not too small.
TM Tractor has the parts for the fuel system, here they are below, they have good pics of the fuel line.
If it is leaking at the shutoff handle, slightly tighten the nut at the stem, there is a packing inside. That should stop the leaking. Don't tighten it too much, it could make it hard to turn. :)

http://www.tmtractor.com/new/fl/864fp.htm

http://www.tmtractor.com/new/fl/426fp.htm

http://www.tmtractor.com/new/fl/235fp.htm

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Re: Bad compression

Postby Cubfriend » Sun Jan 15, 2017 9:05 pm

ParlowMillFarm wrote:Bob,

Thanks again for the tip on the carb cleaner - worked wonders.

Glen - I checked the plugs, they are all in place.

I'm waiting on my new torque wrench, and will put in the pilot bearing while I'm waiting on it. Take a look at the old one next to the new one. The old one is shorter and worn down to a sharp edge at the leading edge.

Sort of funny wear pattern. Is this after what happens after 69 years? or is this indicative of something else?
Old-new_pilot _bearing.JPG
I question whether the wear pattern on the pilot bushing is related to the retainer on the front of the transmission being installed backwards allowing the shaft to move fore and aft. Frank
John
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Re: Bad compression

Postby ParlowMillFarm » Mon Jan 16, 2017 1:50 pm

Frank,

Thanks for the observation. In my earlier post I have a photo of the old and new pilot bearings side by side.

Old-new_pilot _bearing.JPG
old and new, notice legnths


I have made a rather basic drawing of how the pilot bushing sat at the end of the crankshaft and you might notice that the crank end is also worn.

The green is how the new pilot bearing sits as opposed to the worn one.

pilot bearing issue.jpg
cross section of pilot bearing


Can I check out your theory by inspection from removal of the transmission cover? Can I lift the cover off and I can make the shaft flop back and forth? Or am I looking at a resplitting of the tractor?

John

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Re: Bad compression

Postby Cubfriend » Mon Jan 16, 2017 5:11 pm

Unfortunately you may have to split the tractor again but you can try a few things first. Do you know if your PTO has trouble staying engaged. If the transmission front seal retainer is installed backwards it will allow the main shaft to travell fore and aft which will allow the PTO to become disengaged especially under load.(with an implement) If you can get ahold of the main shaft you may be able to move it back and forth. It should not move very much. The front bearing retainer should be installed so that the raised lip on the retainer is inserted into the front of the transmission case. Flat side of retainer visible. Picture of retainer on TM's site. Good Luck! If I can be of any further assistance let me know. Frank
Frank

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Glen
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Re: Bad compression

Postby Glen » Mon Jan 16, 2017 7:00 pm

Hi,
The pilot bearing should go into the hole in the crankshaft so it is not sticking out of the crankshaft. Without being there to see it, I don't know what is different about yours. A pic of it would have been helpful.
Here is a page from the Cub service manual of the front of the transmission showing the retainer and seal.
Also a listing from TM Tractor showing a new retainer and seal. The bulged side has to face into the transmission, then the seal lip is facing towards the transmission. :)

http://www.farmallcub.info/manuals/gss- ... 006-06.jpg

http://www.tmtractor.com/new/tr/431fp.htm

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Glen
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Location: Wa.

Re: Bad compression

Postby Glen » Tue Jan 17, 2017 9:25 pm

Hi,
Here is a pic of the crankshaft and pilot bushing from TM Tractor. It should look like this. :)
Attachments
Cub pilot bushing.jpg

ParlowMillFarm
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Re: Bad compression

Postby ParlowMillFarm » Wed Jan 18, 2017 9:50 am

Thanks Glen,

very helpful.

John


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