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rebuilt engine question

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Rusty8N

01-07-2005 09:55:50

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Putting 8N back together after bottom engine was rebuilt...have seen mentioned on this board that rebuilt engines can be "tight"....others say they ought to turn easily with a hand crank...this one is in "tight" catergory...cannot turn with crank or rock in 4th gear or get to turn when towing (wheels lock when clutch is released in 4th)....but, engine turns with starter....what do you experienced hands make of this...it has not started yet (various carb and spark issues, evideintly...for another post)...is there a problem here that should be resolved before I get it running???

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Nitro

01-08-2005 09:00:27

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Re: rebuilt engine question in reply to Rusty8N, 01-07-2005 09:55:50

Before tearing the motor apart I would take the starter off first and see if you could turn the engine over with a small crow bar. Try it in two steps,first with starter off try to turn the engine if it turns but is very tight its probally the engine. Second if you try to turn it and it will not turn, have someone push the clutch down and see what happens. If it starts to turn with clutch pushed down then you have a transmission problem. I had one awile back get stuck between two gears and it did the same thing. It would feel like it was going into all gears but it wasnt. A common problem with the 8ns where that the guides on the shifter cover would wear out causeing it to go into two gear at once. Hope this helps!

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Jack Jackie Finch

01-07-2005 14:53:54

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Re: rebuilt engine question in reply to Rusty8N, 01-07-2005 09:55:50

I don't know if it is possible to install the connecting rod bearing caps backwards on an "N" engine , but I did exactly that on a 1954 ford 6 cylinder once. It acted just as you describe ,being backwards allowed the bearing inserts to twist just enough to keep the engine from turning over faster than the starter could turn it

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Ramrod

01-07-2005 12:32:45

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Re: rebuilt engine question in reply to Rusty8N, 01-07-2005 09:55:50

Rusty, what the others said, plus, is your tranny jammed? This sounds more like a tranny/drive train problem that an engine problem.

Ramrod

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Rusty8N

01-07-2005 13:00:08

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Re: rebuilt engine question in reply to Ramrod, 01-07-2005 12:32:45

Thanks for the responses!

Ramrod..it seems to shift easily into all gears...would that happen if transmission was jammed??

Crazy8...what you said about starter turning it is what I'm hoping...would others disagree? or have I already damaged by turning it with starter??

Thanks Rick and Joe...I assume what you are saying is to take it back apart and check clearances? I can't really access the guy who did the rebuild...at my present stage of knowledge/experience, that would mean having some one come take it away and get it going for me.

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crazy8

01-07-2005 12:06:31

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Re: rebuilt engine question in reply to Rusty8N, 01-07-2005 09:55:50

I posted a problem having a tight motor within the last few days. The problem was in the clearance on the main bearings. I had the crank ground by a very reputable shop.He told the size of the new bearing I would need. I thought everthing would be a piece of cake(yeah right).It was only after i putit all together I found the problem. The lesson I learned was to check clearance with plasti-guage and dont assume it all fits because its all new.Yours doesnt really seam that bad if the starter will spin it.But check clearances to be safe.

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Rick H. Ga.

01-07-2005 11:30:15

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Re: rebuilt engine question in reply to Rusty8N, 01-07-2005 09:55:50

I have rebuilt two old Ford tractor engines; my 49 8N in 2001, and, recently, my 53 Jubilee project tractor engine. They both spun over fairly easy by hand with the crank and new main bearings installed. When the pistons and rods were installed the resistance increased quite a bit; both were too tight to turn by hand; both would turn fairly easily with a big screw driver or ratchet.

I would say, as Joe mentioned, that it is very important (to know for sure) what the bearing clearances are by using plastigauge or other method of clearance measurement. HTH. Rick H. Ga

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Joe (IN)

01-07-2005 10:34:22

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Re: rebuilt engine question in reply to Rusty8N, 01-07-2005 09:55:50

There are two basic reason for a fresh N motor to be tight. They are incorrect clearances in the bottom end and tight rope seals on the crankshaft. The former spells certain death for the engine very quickly upon startup and the latter does not. Who rebuilt the engine? Do you know if the bearing clearinces were checked with plastigage as it was assembled? Do you know how the rope seals were installed? I've read many posts about tight rope seals here. While they still shouldn't truthfully be that tight, they will wear in quickly when the engine starts. It's not uncommon for the seals to be a bit long and stick out of the ends of the groove by a quater inch on both sides. Some guys insist that they should not be cut off and crank the pan down tight like this anyway. I've even read where this method made the engine so tight that it had to be started with the oil pan bolts loose so it would turn over and then the owner tightened the pan bolts a little at a time while it was running. The ends should be trimmed back to about 1/16". This allows enough compression on the seal to make it seal up, but the engine can still be turned with a reasonable effort. The engine for my '52 8N is freshly overhauled on the stand awaiting installation this weekend if all goes well and I can turn it with a 12" rathet without much effort. The bearing clearances are a different story. If they are too tight, oil will not be able to get between the crank and the bearing and the spinning crankshaft will very quickly make its own clearance without your guidance. That's not good. I personally wouldn't even consider starting it until you know for sure why its that tight. If you didn't build it yourself (in which case you probably already know when it started getting hard to turn), I'd be having a chat with whoever did. Good luck!

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gahorN

01-09-2005 10:57:18

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Re: rebuilt engine question in reply to Joe (IN), 01-07-2005 10:34:22

Yep. An engine that cannot be turned by hand is an engine that is likely to have bearing problems. Advice that encourages you to keep turning it is not good, because all you'd be doing is transferring metal from the bearing to the shaft, and it's only a matter of time before bearing failure will occur if it ever does start.
Fix it right before you try to turn it again or try to start it.
I recommend Lubriplate engine assembly grease (light cream color) be used on all engine assembly, expecially at bearings.

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