Farmall W6 Question

[extremewhitetail]

Good Afternoon
I have a W6 I am working on. I noticed this morning when I pulled the pistons, the pistons were out of order, numbers stamped on rods. I know the firing order but the pistons don t install per firing order do they.

I thought piston one was closest to the driver then proceeded to 2, 3, and 4.

I hope I explained this right!

 

[old]

#1 piston/cylinder is the one that sits closest to the radiator and #4 to the rear of the engine. So front the back of the tractor the cylinders are 1,2,3,4

 

[extremewhitetail]

Wow! Maybe I should look into a different Hobbie. Than you for setting me straight on this. Thank you!

 

[centash]

If the engine ran ok and is apart for other
reasons, probably best to put them back in
the way they came out...otherwise, as Old
said...

Ben

 

[Janicholson]

The question remains were they 1234 from the front, or some non-linear thing like 1423 or other? the answer still is that if it was running and the bearing s look ed evenly worn, and the numbers were all on the cam side of the block, put them back where they were. Also make a note of that in your repair manual! Jim

 

[redforlife]

Piston numbers should (or should of) been
the same as they were numbered for the
firing order. 1 being at the front. 2,3,
and 4 as you go back. Stands to reason (in
my view anyways).

Somebody (MAY) have had this thing apart
for a previous overhaul. And they
overhauled it, but failed to see to it that
rods or pistons were put back in, in proper
numerical order. Maybe didn't notice the
numbers, or didn't even look for them. But
whatever the case, if they re-sleeved it
and put in all new bearings, it really
didn't matter what hole they put them back
in, as long as they were doing things right
otherwise. That'd be my guess as to what
happened.

In any event, I'd put this thing back
together as it were, unless I was re-
sleeving this thing and putting new
bearings in at the time of this tear down.
Then I might consider putting this back
together with the numbers right as they
should be.

If you change things around without
overhauling, then thier will be increased
wear where things have worn differently.
Kind of a NO NO if not doing an overhaul at
the same time that it's apart.

 

[BarnyardEngineering]

Yes, 1-2-3-4 front to back, but you can set up the ignition system either way and it will run just fine.

However, one nit-picky bit here. A W6 is not a "Farmall." A W6 is a "McCormick Deering" because it is a standard tread tractor. Farmall tractors are the row crops, the A, B, C, H, M.

 

[extremewhitetail]

The whole reason I took it apart is because the farmer I bought it from said it started making a sound and he shut it down. I bought it from him and opened it up. Noticed number one piston was in number two hole and number three was in number four hole. Number one has a spun bearing that damaged the crankshaft. Now I need to remove the whole darn block and have the crankshaft turned and polished. I appreciate all your help guys. Thank You

 

[BarnyardEngineering]

Someone wasn't paying attention when they assembled it. These engines were built with fairly large tolerances by today's standards so it really shouldn't have made a difference, but maybe if they used the old bearings and swapped them around on the crank, that could have been the cause of the spun bearing.

 

[old]

In that case I'd put the piston back in there correct holes but also while having the crank turned have the rods checked also

 

[extremewhitetail]

I sure will. How much can I have the crankshaft turned. Is it similar to pistons. .010, .020, etc.

 

[John M]

Your cylinders are sleeved. You dont bore them.

 

[old]

0.010 .20,30 and maybe even 40

 

[old]

He said CLEARLY CRANKSHAFT no sleeves

 

[Steve@Advance]

Since it did spin a bearing, that rod assembly will absolutely have to be
reconditioned. I would go ahead and have all of them reconditioned to
remove all doubt that they are all within spec.

That would mean removing the pistons from the rods and replacing the
wrist pin bushings. If you don't replace the pistons, the rods could be
put back in proper order, and the pistons put back as they are now.

But look the rods and pistons over carefully as some have offsets and
matter where they go. Just because it ran that way doesn't necessarily
mean it was correct.

Also be aware that since it did trash a bearing, the shed material will
be circulated through the oil gallies, and must be completely
disassembled thoroughly cleaned, especially the pick up screen and tube.

A shop manual would be a very valuable investment before going back
together. Used ones can usually be found cheap on Ebay.

 

[extremewhitetail]

Yes tractor sleeves are smooth with absolutely no sign of wear. I'm going to have the block cleaned or washed, crankshaft turned, rods looked over. Going have the local machine shop mic out the crank to match the bearings. The pistons look good but going to put all new stuff while its apart. Like others said to eliminate any doubt.

 

[old]

Even if the sleeves show no signs of wear I would probably replace them any how just for good measure.

 

[r.w.b.]

yep put it back 1234 from front .plus if it has domed pistons must
be installed right way as dome will hit head if in wrong. better
check cam bearings if rod bearing spun. oil goes through cam first
then to rods

 

[John M]

He asked if it was similar to pistons. I was assuming he thought one could bore the sleeves to accept bigger pistons, so I was letting him know he couldnt do that. If you had read the post, you may have caught that.

 

[extremewhitetail]

No worries John! The whole point of these forums is to get everyone's input. New ideals and information is what's its all about. I knew what you were saying. I will order all parts once the block is back. Going to take it in this week since I'm on vacation.