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Old 11-27-2011, 04:09 PM   post #1 of 17
wjohn
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Default Time for a new fan shroud...

I knew I'd have to get a replacement when I bought this tractor, but I'm still amazed.



I think I'll be looking for a '63 or newer parts tractor, since I need a shroud, fan, engine side shields, and a Custom hood for another tractor.

The engine smokes like crazy on startup, so I tore into it. Didn't get any pictures while I had the head off but I found a .005 piston. There's a small scratch in the bore towards the top but the piston still fits tightly so I'm going to try re-ringing it. Lots of carbon. Noticed this nut on a head bolt - the threads were stripped out in the jug.



A few more pictures; one of the grease zerk on the GRW:





Question about honing: What grit number for the stones should I use in the hone? I have 240 and 400 grit. Will I be okay just running the 400 grit a few times, or should I put the 240 in initially and finish with the 400?
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'72 John Deere 110, '39 and '40 Allis Chalmers Bs, '41 WC, '56 WD-45, '80 Gravely 8102, '63 L8, '52 L, '63 LI, '73 CI, '68 C10A, '57 LI, '58 LI, '69 C8, '58? Wisconsin LI, '73 816, '72 816, '40 L SN 2958, '71 450, '81 UFT Mountaineer 120E

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Old 11-27-2011, 08:09 PM   post #2 of 17
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Default Re: Time for a new fan shroud...

The nut for the head was a good save.

If the piston is in decent shape, why not re-ring and get a few more years before going to a larger piston; just break any glaze in the cylinder so that new rings can seat. That will not last as long as a rebore and new piston, but it is much cheaper.

For sure you need a new fan shroud, they show up often on eBay.

I would get rid of that plumbing job on the gas tank also.

Roger,
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Old 11-27-2011, 08:25 PM   post #3 of 17
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Default Re: Time for a new fan shroud...

Quote:
Originally Posted by beaner2u View Post
If the piston is in decent shape, why not re-ring and get a few more years before going to a larger piston; just break any glaze in the cylinder so that new rings can seat. That will not last as long as a rebore and new piston, but it is much cheaper.
What's the best way to break the glaze? Sandpaper, or briefly running the 400 grit stones? Thanks for helping a newbie!

John
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Old 11-27-2011, 09:18 PM   post #4 of 17
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Default Re: Time for a new fan shroud...

Quote:
Originally Posted by wjohn View Post
What's the best way to break the glaze? Sandpaper, or briefly running the 400 grit stones? Thanks for helping a newbie!

John
I'd go with the 240s and then the 400s but don't do it for more than a couple passes each. All you need is to cleanup the bore and not hone it out.
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Old 11-27-2011, 09:24 PM   post #5 of 17
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Default Re: Time for a new fan shroud...

Looks like you could use a gas tank as well.
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Old 11-27-2011, 09:36 PM   post #6 of 17
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Default Re: Time for a new fan shroud...

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Looks like you could use a gas tank as well.
Jack up the gas cap and run another tractor under it?
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Old 11-27-2011, 09:55 PM   post #7 of 17
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Default Re: Time for a new fan shroud...

Quote:
Originally Posted by Fla Don View Post
I'd go with the 240s and then the 400s but don't do it for more than a couple passes each. All you need is to cleanup the bore and not hone it out.
I will do that. I need to get on that order to GT Gravely Parts for the .005 rings.

Quote:
Originally Posted by arcam8123 View Post
Looks like you could use a gas tank as well.
That would also be nice to find on a parts tractor. I was tempted to use the tank and fan/shroud off of my '52 since it's a long ways from running, but that tractor is my future restoration project and I can't bring myself to take parts off of it.
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'72 John Deere 110, '39 and '40 Allis Chalmers Bs, '41 WC, '56 WD-45, '80 Gravely 8102, '63 L8, '52 L, '63 LI, '73 CI, '68 C10A, '57 LI, '58 LI, '69 C8, '58? Wisconsin LI, '73 816, '72 816, '40 L SN 2958, '71 450, '81 UFT Mountaineer 120E

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Old 11-27-2011, 10:18 PM   post #8 of 17
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Default Re: Time for a new fan shroud...

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Originally Posted by wjohn View Post



That would also be nice to find on a parts tractor. I was tempted to use the tank and fan/shroud off of my '52 since it's a long ways from running, but that tractor is my future restoration project and I can't bring myself to take parts off of it.
You can get tanks and fan shroulds for close to the cost of shipping alone. How many do you need?
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Old 11-27-2011, 10:36 PM   post #9 of 17
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Default Re: Time for a new fan shroud...

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Originally Posted by arcam8123 View Post
You can get tanks and fan shroulds for close to the cost of shipping alone. How many do you need?
Just one of each, for now... I looked at what Richard's wanted for a fan and shroud, and that's when I decided it might be cheaper to get a whole tractor.
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'72 John Deere 110, '39 and '40 Allis Chalmers Bs, '41 WC, '56 WD-45, '80 Gravely 8102, '63 L8, '52 L, '63 LI, '73 CI, '68 C10A, '57 LI, '58 LI, '69 C8, '58? Wisconsin LI, '73 816, '72 816, '40 L SN 2958, '71 450, '81 UFT Mountaineer 120E

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Old 11-27-2011, 10:45 PM   post #10 of 17
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Default Re: Time for a new fan shroud...

Any 1960 to 66 tractor can donate the shroud. 1959 and earlier are pie slice cutouts for cooling. 1966 late model to 1976 do not have the rivet holes for the ID plate.
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Old 11-27-2011, 10:52 PM   post #11 of 17
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Default Re: Time for a new fan shroud...

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Any 1960 to 66 tractor can donate the shroud. 1959 and earlier are pie slice cutouts for cooling. 1966 late model to 1976 do not have the rivet holes for the ID plate.
That was another reason for not wanting to yank the shroud/fan from the '52. It would work but it's not correct, and if I recall correctly the newer 4-blade fan actually pulls more air (according to Gravely).
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Old 11-28-2011, 09:32 AM   post #12 of 17
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Default Re: Time for a new fan shroud...

Quote:
Originally Posted by beaner2u View Post
why not re-ring and get a few more years before going to a larger piston; just break any glaze in the cylinder so that new rings can seat. That will not last as long as a rebore and new piston, but it is much cheaper.
+1 Rings do wear out and it seems they wear faster than the cylinder on the L engines.

Ring jobs were quite the thing to do during and after WWII when materials were in short supply. Look at Popular Mechanics magazines from that era. The ads for Perfect Circle piston rings are numerous; many were full page ads.
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Old 12-04-2011, 11:58 PM   post #13 of 17
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Default Re: Time for a new fan shroud...

Alright, I'm picking up a parts tractor over Christmas break so I should be set for the shroud, fan, hood, side air deflectors and gas tank. I'll put in the parts orders to Richard's and GT Enterprises next week.

Forgot to mention that I also believe I have a slightly burnt exhaust valve. It's not destroyed (the tractor does run) but the metal on the top of the valve is not smooth... hard to describe without a picture. There are small raised lumps of metal that I couldn't scrape off when removing carbon. I'll be replacing the valve too.

The PO said a guy at a former Gravely dealership told him that the engine actually runs cooler without the side shrouds. I'm 99% sure that's not true.

One more quick question - what do folks on here use for honing oil?
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Old 12-05-2011, 02:46 AM   post #14 of 17
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Default Re: Time for a new fan shroud...

Just motor oil works for me, but be sure to scrub with hot soapy water when you are finnished honing.

Roger,
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Old 12-05-2011, 10:28 AM   post #15 of 17
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Default Re: Time for a new fan shroud...

Quote:
Originally Posted by beaner2u View Post
Just motor oil works for me, but be sure to scrub with hot soapy water when you are finnished honing.

Roger,
+1 Those little scratches will hold all manner of abrasive powder. I scrub a cylinder at least 3 times. Scrub with soapy water, rinse, dump the water in the sink and do it again....and again and again.
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                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

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