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05-01-2016, 02:21 PM | #1 |
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Engine turns by hand, with effort...
I removed one shim from my front main, and one from my rear main. They were foil-thin, and measured .001 each. All three mains are now .0015; I used assembly lube.
The engine turns by hand, but with about 20 lbs of arm pressure. The rods are not connected yet. Is this too tight to start? I'd hate to get the engine back in the car and find that the starter can't handle it.I would suspect that the ring gear will gear it down enough, but I just don't know. This is my first rebuild.
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05-01-2016, 06:54 PM | #2 |
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Re: Engine turns by hand, with effort...
For whatever reason, it takes about 40 or 50 lbs of my pull to turn the engine now. does anyone have any advice on this? I can put shims back in the main bearings (babbitt) to make it turn easier, but only if it is advised. I've got them all torqued and cotter-pinned.
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05-01-2016, 07:25 PM | #3 |
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Re: Engine turns by hand, with effort...
Try pushing the crank fwd in the block and turning it, then push it back and try it again and see if there is any difference.
Personally i would put the shims back in.... |
05-01-2016, 07:59 PM | #4 |
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Re: Engine turns by hand, with effort...
I've seen the front rope seal put a lot of bind on a fresh engine, until it runs for a couple hours.
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05-01-2016, 08:27 PM | #5 |
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Re: Engine turns by hand, with effort...
Oh, my engine is still on stand without the connecting rods on yet. no rope seals yet. This is just the mains that are tight. I was wondering JUST HOW TIGHT they should be.
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05-01-2016, 08:39 PM | #6 |
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Re: Engine turns by hand, with effort...
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05-01-2016, 09:21 PM | #7 |
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Re: Engine turns by hand, with effort...
When you first tried it and it took 20 lbs. it had some lubrication on the bearings. When you turned it some of the lubrication came off. Then it sits and a little more is pushed out.
When you try to turn it again it takes more to turn it. That's why it might have taken 50lbs. If you lubed it up again you might go thru the same thing. It sounds like the clearanses could be a touch tight. |
05-01-2016, 09:23 PM | #8 |
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Re: Engine turns by hand, with effort...
let us know how you make out
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05-01-2016, 09:53 PM | #9 |
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Re: Engine turns by hand, with effort...
I agree, with just the crankshaft mounted, this is too tight. It should take very little effort to spin just the crank.
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05-01-2016, 09:55 PM | #10 |
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Re: Engine turns by hand, with effort...
The bearing caps are properly faced with marks to the front as originally. When I took the engine apart, the bearings, front to back had these clearances: #1 - .0002, #2 - .0015, and #3 - .0020. The babbitt was good, so I tried to get all the same clearance (and did). They are presently all .0015 ; It looks like I should have left the shims as they were.
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05-01-2016, 10:02 PM | #11 |
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Re: Engine turns by hand, with effort...
I wonder if the crank journals are oval, and you are measuring the narrow part?
It should spin quite easily at .0015" clearance. |
05-01-2016, 10:06 PM | #12 | |
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Re: Engine turns by hand, with effort...
Quote:
I put in new valves, guides and springs. Got new pistons, wrist pins, and rebabbitted connecting rods (they were all way off on weights (30g difference between them!)). I left the mains alone, except I removed .0005 shim from the front and the rear. I was surprised to find the center main to be the best tolerance of all. This is where I am at... the main caps are on and torqued, and it's hard to turn. Pistons and rods are not in yet.
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05-01-2016, 10:09 PM | #13 | |
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Re: Engine turns by hand, with effort...
Quote:
Thanx to all for the help. Chuck
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05-01-2016, 10:16 PM | #14 |
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Re: Engine turns by hand, with effort...
I didn't know you could get main shims in .0005" thickness. I wonder if it wasn't thicker than that?
At any rate, I'd reinstall it. |
05-01-2016, 10:23 PM | #15 |
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Re: Engine turns by hand, with effort...
what are you using to measure with?? somethings really amiss.....
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05-01-2016, 10:24 PM | #16 |
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Re: Engine turns by hand, with effort...
I just took ONE .001 shim from one side. That is .0005 from the whole thing, right? I believe it I took a .001 shim from both sides, It would make the whole clearance .001 difference. Correct me if I'm wrong.
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05-01-2016, 10:30 PM | #17 |
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Re: Engine turns by hand, with effort...
I use a decent metal Midway caliper (dial) I bought in the 80's and the shim measured .001
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05-01-2016, 10:37 PM | #18 |
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Re: Engine turns by hand, with effort...
you can get away with measuring the shims and OD of things with a caliper, but they really botch things up when measuring the ID.
You really should invest in some better measuring tools like T gauges and micrometers before going further. Or at least some plastigauge.... |
05-01-2016, 10:39 PM | #19 | |
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Re: Engine turns by hand, with effort...
Quote:
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05-01-2016, 10:47 PM | #20 |
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Re: Engine turns by hand, with effort...
did you try prying the crank to the front and rear of block and spinning it??
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