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Overhaul questions

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OverMyHead

04-08-2003 17:16:52

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I am rebuilding my 8N engine after it developed a sever knocking this winter. I am to the point of reassembling the pistons/crankshaft. I am in way over my head as far as experience goes. I am a mechanically inclined person, but never done this before. Here's my question.

I installed the crank shaft and tested it for smooth rotation, it turns very nicely without any noticeble drag. I then attach all the piston/rod bearings and it becomes impossible to turn the crank shaft. Should I expect to be able to turn it with all the pistons attached. I know it wouldn't be easy, but seems like I should be able to use some leverage on the fly wheel end and be able to turn it, I can't. I'm hesitant to proceed with re-assembly without knowing that I have it right. Am I expecting it to be to easy to turn?

Different topic----
I need a lesson in gasket installation. I thought I read that modern day gaskets don't require any cement(not the right term). Do I need to apply something to all the gaskets when I put them in, or only certain ones?

Any and all help will be greatly apprecated.

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Dan (Myersville)

04-09-2003 10:02:43

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Re: Overhaul questions in reply to OverMyHead, 04-08-2003 17:16:52

You should be able to turn the engine over with modest effort using a 1/2" ratchet on the crank pulley bolt (head off).

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OverMyHead

04-09-2003 05:43:06

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Re: Overhaul questions in reply to OverMyHead, 04-08-2003 17:16:52

Thanks for all the help and suggestions. I have lots of work to do, I'll back in a few days, I'm sure.

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TimK

04-09-2003 09:00:08

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Re: Re: Overhaul questions in reply to OverMyHead, 04-09-2003 05:43:06

Did you also replace the rod bushings and hone to fit ? The piston pins should drop fairly easily thru the bushings.

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PeterH

04-09-2003 05:22:07

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Re: Overhaul questions in reply to OverMyHead, 04-08-2003 17:16:52

I had a similar experience when I overhauled my 8N. It turned out that I had put one of the Piston rod bearing caps on backwards. The marking on one of the caps was backwards/reversed compared to the other caps. I originally installed the caps so they all looked the same when installed. I should have made sure they all mated the same, that is all the interior notches were positioned the same way. Once I corrected that, everything rotated properly; some resistance but it would rotate when using a short bar on the crank shaft.

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Rick H. Ga.

04-08-2003 18:34:27

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Re: Overhaul questions in reply to OverMyHead, 04-08-2003 17:16:52

When I overhauled my 49 8N engine a couple of years ago, the assembly was rather tight to turn by hand. I had to use a big screwdriver to turn it over after I got the new pistons, rings and bearings installed. I used a high quality assembly lube and oiled the inside of the cylinder sleeve walls good.

I have read that a freshly rebuilt engine will be a little tight to turn by hand (unless you are a power lifter.:-) and it is normal to have to use a tool of some kind to turn the engine over. But, you should be able to turn it over easily with a ratchet or screwdriver. HTH. Rick H. Ga.

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OverMyHead

04-08-2003 18:18:05

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Re: Overhaul questions in reply to OverMyHead, 04-08-2003 17:16:52

I suspect that you have hit the nail on the head. I bought new pistons and new sleeves and assumed that they would fit correct. If the test in Fig F)43, pg 34 is to tight, do I have to have the sleeve bored out. I assume they are doning that test without the ring. Would it be typical for me to have to bore the sleeve to fit a new piston?

I also need to check the ring end clearance. I did not do that. Made the same assumption about new parts. Shows my inexperience. I have the pistons installed but they are pretty tight to move. I guess that is probably the root of my problem.

Thanks,

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Dave Smith

04-08-2003 18:49:54

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Re: Re: Overhaul questions in reply to OverMyHead, 04-08-2003 18:18:05

You said you had a knock. Did you check the crank for size and out of round? Did you plastigauge all the journals before final assembly? Do you have the right size bearing inserts? Ring end gap is real important. If they are too tight when they heat up and expand they can bind and break the piston lands or break themselves. Then you got problems.
Dave <*)))><

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OverMyHead

04-08-2003 18:54:11

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Re: Re: Re: Overhaul questions in reply to Dave Smith, 04-08-2003 18:49:54

Yes I did check all clearances. I had a professional redo the sleeves, valves and resize the journal bearings. I'm taking it from there. I think my problem is in the piston fit. I probably didn't pay enough attention to ring end clearance and bore size. That should be easy enough to check at this point.

Thanks,

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Dave OH

04-09-2003 21:17:43

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Re: Re: Re: Re: Overhaul questions in reply to OverMyHead, 04-08-2003 18:54:11

If you bought the new sleeves and pistons with rings as a kit they messed up. Call them if you have a problem with ring end clearance.
Dave OH

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JimNC

04-08-2003 17:51:42

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Re: Overhaul questions in reply to OverMyHead, 04-08-2003 17:16:52

You should be able to turn the rotating assembly with very minimal effort. Did you check the ring end gap, correct bearing size? Did you fit the pistons to the sleeves per the FO-4 manual?

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