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Ford 9N, 2N & 8N Discussion Forum
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rebuild gone bad

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RAGinTn.

01-10-2007 12:19:13




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hey all ive been rebuilding my 49,50?? 8n and all is going well until last night when I torqed all the pistons caps down (35 ft. lbs) so I have new bearings that are .020 the crank is .o2o everything is numbered and put back where it goes and how it goes but when I tighten down # 2 i can't turn the crank. I tried switchen the bearings with # 4 and 2 still wont move I took the piston out turned it around on the rod and put it in reversed it still wont move. when I put the bearing in the cap and place it on the journal by itself i cant move it easy it sticks like its clamped on thair almost like when the cank was turned thes didn't touch that one but all the bearings that come off were all .020 and the crank seemed to be in good condition so whuts up any help wold be appretiated or if you need more info let me know

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Hobo,NC

01-10-2007 18:08:09




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 Re: rebuild gone bad in reply to RAGinTn., 01-10-2007 12:19:13  
Heres the deal, you bolted up the crank and could turn it with not to much trouble. Then you installed the rods and pistons and all went well till you got to this one, you have a problem take the advice of Zane and bob and find the problem NOW, I spec you have a rod cap switched and may have to remove all the rods and have’em checked or go the plastic gauge rout. I have built one engine that would lock up when I tighten a rod cap down. It waz a 3.9 Chrysler V6 I know I had the rod caps rite so I tried a rod bearing from another rod I had installed and it did not lock up, I then installed the bearing into the known good rod and it werked, I took the chance it would be OK , I had the crank turned and checked it as I always do, its still running after 7 years but even to this day I wonder. I should have had the rods checked. I know how a rod bearing should feel and it felt ok but it did have a little bearing knock cold after a year or so. I wrench for a living and should have known better but it was my own truck so let it go. I did buy after this a inside bore gauge to check this if I ever run across it again. I spec I either damaged the bearing on install or had a out of round rod big end that werked ok on a worn out bearing and crank. Why I wuz able to swap’em and it werked out I dunno, why this happen on the last rod I installed I dunno, if it were a pay’in custome I would have found out, free truck all I had in it wuz the engine parts I took the chance but would not advise you to take the chance.

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RAGinTn.

02-05-2007 23:16:36




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 Re: rebuild gone bad in reply to Hobo,NC, 01-10-2007 18:08:09  
Well it was awile ago now but I figured it out the guy that was in thair b4 me had them all marked a lil differently than I would have done it (I used to wrench for a living) the cap in question just needed to be turnt around when i took it appart i noticed that 1 was marked on the cam side 2 was marked opposit 3 cam side 4 opposit well turns out the marks on the caps were turned around the rods were right my guess is the guy took it all apart nd set it on the bench the way he thought he took it out and then marked everything. Isaw they were marked noted how he had em but didn't think to check the rods against the caps Ishould know better than to trust someone elses work

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ZANE

01-10-2007 17:35:39




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 Re: rebuild gone bad in reply to RAGinTn., 01-10-2007 12:19:13  
I would call the machinest and get him to come out and check that journal. It may be ground wrong???

Are you sure that the rod caps are on the same rods they came off? Did you have the rods rebuilt? Bolt the rod cap on the rod with it out of the engine and see if the fit between the two halves is perfectly even with nothing to catch a finger nail on. If you have anything to catch the finger nail it is on the wrong rod or it is backwards. The bearing tabs should be together. The piston has to go with the mark or size mark toward the front. The piston pin is not in the middle of the piston so it is not interchangable front to back. Got to go the right way. Hard to see the offset but it is there.

Zane

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Bob

01-10-2007 16:38:10




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 Re: rebuild gone bad in reply to RAGinTn., 01-10-2007 12:19:13  
Did you have the rods checked for straightness, and the "big ends" checked for size, and reconditioned as needed at the machine shop?

Either the one crank journal was ground wrong, or rod cap(s) have been switched around, damaged, or incorrectly installed.

Are you installing the rod caps so that the cutouts for the bearing "tangs" in the rod and the cap are on the same side?



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old

01-10-2007 15:09:01




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 Re: rebuild gone bad in reply to RAGinTn., 01-10-2007 12:19:13  
First off are you useing a good prelube?? If not then thats your problem. Now if you are then something isn't right or you just plan have a tight engine. I've rebuilt a lot of engines and when I got done they where tight enough that you couldn't turn them by hand but the starter turned them easy and some of those engines are still running today, some not any more but after 300,000 miles I guess they shouldn't be

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Hobo,NC

01-10-2007 17:46:39




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 Re: rebuild gone bad in reply to old, 01-10-2007 15:09:01  
I spec most enny engine I have built I could not turn it with my hand, I spec I could not turn a worn out engine with my hand. I could easily turn it over with a ˝” ratchet tho. would you clarify, “ I've rebuilt a lot of engines and when I got done they where tight enough that you couldn't turn them by hand”



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old

01-10-2007 18:30:36




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 Re: rebuild gone bad in reply to Hobo,NC, 01-10-2007 17:46:39  
Turn by hand I.E hand or with a wrench. But as I also said a starter would turn them over just fine, but a starter has a lot more torque then you can get with any wrench unless you use a 6 foot cheater bar



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Mike Seybold

01-10-2007 14:50:47




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 Re: rebuild gone bad in reply to RAGinTn., 01-10-2007 12:19:13  
Mic number 2 if its round and the finish is ok get the proper bearing. All bearings should be checked with plastigage.



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crazy8

01-10-2007 14:13:44




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 Re: rebuild gone bad in reply to RAGinTn., 01-10-2007 12:19:13  
I had the same problem. The machine shop goofed on the one journal.



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