1965 6.6HP Engine Teardown - Page 3 - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #31 of 38 Old 10-22-2019, 05:04 PM Thread Starter
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Re: 1965 6.6HP Engine Teardown

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Originally Posted by Gerrard View Post
Wont some stuff like types of steel crack if real cold and it gets struck with something?

Good luck man!
The crank pin was already chilled, like at -10F for a couple of days in the freezer. Bringing it down to maybe -40F is only a 30F change. Time will tell if this is to rapid of a change but I believe it will be harmless.

RB
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post #32 of 38 Old 10-22-2019, 05:23 PM Thread Starter
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Re: 1965 6.6HP Engine Teardown

Got the call, crank is ready. When I picked it up it was trued to the Harley spec, within .0025". It took him about an hour of shop time but he charged me a lot less. I do mean less. He enjoys working on stuff I bring (fitting the oil pump shaft to a new bushing).

I placed the crank in the fixture I have and found his work to be as stated. This fixture is different and I use it with the straight edge, dial indicator and dial caliper methods of checking trueness.

A Gravely owner out in NW Conn had manufactured this fixture and was willing to part with it. I realize it is not the traditional method of truing but I it works for me until I locate something better.

RB
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post #33 of 38 Old 10-22-2019, 09:50 PM
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Re: 1965 6.6HP Engine Teardown

Looks good to me for what little I know about it but as it turns you can see if it true or not, wether or not its able to be measured I dont know but you'd think it would be close.
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post #34 of 38 Old 11-06-2019, 08:28 PM Thread Starter
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Re: 1965 6.6HP Engine Teardown

Bottom end has been assembled, had issues but were identified and resolved.

The flywheel when rotated would hit the idler gear bearing bolt when rotated. Just one localized spot on the flywheel. At first I was checking the flywheel clearance to the block casing, then the idler gear teeth. Split the casing and removed the crank assembly and inserted an extra timing pinion shaft into the casing. No noise!
That eliminated the teeth as the cause. Installed the flywheel and the checked the inside edge of the flywheel. Found it! The idler gear bolt was hitting the flywheel. The interference was slight, just enough to cause a clunk noise. Rotated the bolt a couple of degree and solved the noise.

I did have the bearing cap installed, but with no shims. The shims may have provided the needed clearance but to install them at this stage of assembly imo is to early....couple of lost hours.
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post #35 of 38 Old 11-06-2019, 08:48 PM Thread Starter
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Re: 1965 6.6HP Engine Teardown

Time to check the jug. Should be ok, remember it was just rebuilt by a pro. Looked ok but.....

Light scoring was visible in jug, nothing deep but should not be there.

Pulled the exhaust valve, noticed slight burr on stem caused by the keeper. Light file to remove. Spring cap had excessive wear on stem hole.

While pulling the intake valve the keeper caused a heavy burr, the worst I have seen. Hard filing to just remove the spring cap. Pulled valve and wow, had to toss the valve. the keeper slot was to wide! Way to wide, question if this is a Gravely valve. There was about a tenth of inch space when a new keeper was installed in the slot.

Ended up replacing the intake valve, spring, spring cap and keeper. Lapping valves and honing the cylinder. Replaced the exhaust spring cap and keeper.
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post #36 of 38 Old 11-06-2019, 08:51 PM Thread Starter
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Re: 1965 6.6HP Engine Teardown

This is the end of today. Heavy work done!

RB
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post #37 of 38 Old 11-07-2019, 07:04 PM
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Re: 1965 6.6HP Engine Teardown

While you have the engine as shown in the photos, TDC of compression, mark the exhaust cam extension on the top of the shaft, it will make timing the magneto easier. Some exhaust cam shafts actually had a 'punch' mark for TDC.

You will want the nut on the timing coupler 'up' when your timing mark is visible. Make sure the snap of the impulse arm occurs at TDC or a tich after.

Roger,

Faux Pas are my forte

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post #38 of 38 Old 11-07-2019, 08:55 PM
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Re: 1965 6.6HP Engine Teardown

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I'll get back w/you on this, dont wanna jump an important thread or anyones thread for that matter.

Thanks
Aold dude that worked at the Gravely plant told me that the pistons came from Chrysler, so does that sound like a piston from a .318 c.i. ? That has been worked on?
I just dont get why he would say that at the Gravely / Ariens ( or whatever it is) shop right across from the plant in front of a bunch of other old guys.
Might be Gravely/ Polaris.
It was where I went as soon as I got my Gravely. And the prices they charged I didnt go back, exept to return the spark plug they charged me $ 18 for.
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