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U6501 Continental 6 cylider gas engine

rdrodgers

Registered
Hi, have an old (1940's) U6501 Continental 6 cylinder gas engine out of an 1940's Holabird Fire Truck that needs rod and main bearings .020 undersize.

Also need head gasket though there is a company I can have copy it.

Any idea where a set of rod and main bearing .020 might be located or who to call?

would like to get this engine back together so the fire dept can do the rest of the work on it getting it ready for parades.

Or any ideas what engine I could adapt to it that parts are easier to get?

Has a large diameter bell housing and nothing in my area has anything this large.

Thanks in advance for some direction or suggestions.

Roy
 

John Schwiebert

Registered
O. K. do you dimensions for the crankshaft as in diameter and width of the bearings? I need to do some thinking as well as some of those large
Continental engines were also used by the military and you may need to check with dealers of military engine parts.
 

rdrodgers

Registered
I will dig my manual out again, but best I remember both rod and mains were the same size as for the shaft diameter thought the outside of the shells were different.

I'll hunt the manual tomorrow and give exact measurements.
 

Bud Tierney

Registered
That U6501 seems to've been one of Cont'ls "individual" engines, meaning there doesn't seem to be a U-series of engines, only the U6501 "automotive", the U501 "Ind'l" (and possibly a PR501 Power Unit--see below) per Cont'l terminology of the period...
A couple bearing catalogs state it only shares bearings with the 22R up to #12264 and the late 33R. The 22R seems to've been a considerably more popular engine, at least in over-the-road trucks, as most of my period catalogs don't list these Us. I don't have anything on the 33R...
The PR501 listing is in a 38 Victor gasket catalog under "models 22R, 33R, 35B, PR501"...that catalog doesn't list the U6501 or U501, unusual unless this engine originally introduced as that Power Unit and then later used in other eqpmt???
As to engine swaps try Garrad Moon at Monte's, northwest of Chicago now but emails the same;
garradmoon@montes@flash.net or montesequipment.com
 

rdrodgers

Registered
That would be correct.

Here are some numbers according to the service manual I have on this engine:
Industrial#s U501
Transportation #s: U6501

According to the manual standard size for both rod and main bearings are: 2.7485/ 2.7475 (crank pin)

Bore and Stroke: 4 1/2 X 5 1/4

The manual also gives the outer sizes of each main bearing shell as well as the outer diameters and width of the rod bearing shells.
 

John Schwiebert

Registered
That is what we need! The diameter of the mains and the rods plus the width and what do they use for a thrust bearing + the housing bores of the mains and the connecting rods.
 

rdrodgers

Registered
As they appear in the manual
Main Bearing- Front 2 3/4 X 1 3/4
Main Bearing - (4) Int. 2 3/4 X 1 11/16
Main Bearing - Center 2 3/4 X 2 13/16
Main Bearing - Rear 2 3/4 X 2 13/16
Rear Main Bearing also controls the thrust.

This manual also gives the bore of the hole for the bearings as well as bearing thickness:
Mains bore in the block 2.9420 / 2.9410 Thickness .0957 / .0952 Wear limits - .0947
Diam of main bearing journal: 2.7485/2.7475

Con Rod Bearing Diam and length 2 3/4 X 1 13/16
Con rod bearing bore: 2.8745/2.8740
Con crank journal dia: 2.7485/2.7475

If I have missed something or confused anyone please say so.

Thanks for the interest.
 

rdrodgers

Registered
Received an e-mail this morning that maybe these parts have been located, but will take a couple more days to confirm.

If so... WOW!

So don't take all your time up burying your heads in the books, maybe (maybe) there are some hiding out there yet.

I will update as soon as I know one way or other.

Thanks again
 

Bud Tierney

Registered
FWIW, just noted slight?? discrepancy in my only two bearing catalogs that list the U6501; don't know if applicable to yours...
1956 Fed-Mog Shop Specs manual, 9th Ed, 126 pgs lists "...U6501, 22R to #12264, 33R, U501.." and lists a thrust washer used on rear of #1 main...
1962 Thompson Products brg catalog B-66, 177 pgs, lists "...U501, U6501, 22R 3rd Series (exc Federal truck) 33R (late)..." This catalog has no mention of thrust washer.
Thompson also has note---Fed trk after #12265 uses a different #4 main, the locking lip location 11/32 from end versus 13/16 from end of non-Federal trk bearing...
Neither catalog has any other listing for any of the above engines...
Like many others, I often railed about parts people coming up with the wrong parts; since using these old catalogs, with their discrepancies, I'm surprised they came up with the right ones as often as they did...
 

rdrodgers

Registered
No thrust washer behind first main bearing on this engine. Same general shape as a Chevy 350 thrust bearing at the rear, just quite a bit larger.

---------- Post added at 02:36:58 PM ---------- Previous post was at 02:31:28 PM ----------

Can't figure out if I can delete the last post or not, but I will have to eat crow on that one. There are two thrust washers at the first main bearing cap, one in front of the cap and one behind the cap.

The rear main is just a regular bearing, no thrust sides to it after all.

So your are correct and I was not on that. My bad.

---------- Post added at 02:57:09 PM ---------- Previous post was at 02:36:58 PM ----------

The manual also shows a "shim pack" with differing thicknesses of shims along with one think washer in the front of the bearing and one on the rear of the bearing.
 

John Schwiebert

Registered
I am used to the Continental D & F series engines which use the same bearing set. They both use the front main to control thrust. The shim pack is used to set the crankshaft end play to the correct amount. I will not look up any bearing sets, but FYI for you I know insert bearings have also been reoured.
 

rdrodgers

Registered
Thanks, I have looked into having the old set repoured, but one main bearing spun and the block had to be line bored, and one rod bearing shell is beyond repair as well as the main bearing shell that spun.

I do have a lead on a set and hoping to know in a few more days.

Thanks again for the help and suggestions.
 

keith1944

Registered
Douglas County Fire District #2 in Roseburg Oregon has a 1940 Holabird pumper parade unit. It was originally owned by Veterans Administration Medical Center, Roseburg. I can put you in touch with their mechanic if you want.
 

rdrodgers

Registered
Yes please. The more information I can get from someone who has worked on one the better off I will be. Thank you. Should I private message you my contact information?
 

rdrodgers

Registered
Parts did not pan out. No rod bearings available, but did have another engine donated so I can get the rod bearings from it.

I'm sure the bearing shells will need to be redone. Anyone know where would be a good place to send bearing shells to have new babbitt or bearing material put on?

Thanks again
 

Curtis Elliott

Registered
You stated you may have had a spare U501 Continental engine donated for a fire truck. I would be interested in buying this engine or any parts if you are interested. My email is Ctobac1@yahoo.com.

Thank you for your time.
 
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