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post #1 of 10 Old 08-11-2019, 03:38 PM Thread Starter
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This embarassing, hope its right anyway.

I cant believe I have been frettin for , well all summer because I was so intimidated thinking it would be to hard for me to do, and I have been told how to do it by many people but I didnt realize ( mainly because its up-side down) that the bigger round gaskets I got for valve springs actually go on the what I call "stacks" that the valves & springs go into the engine itself.! Here is some pics and I hope Im right on this.
Had to use some welding type clamps to hold *&^%$ spring compressors on but it worked great.
But laugh if you must, I deserve it.
Now if this looks right to any of you please let me know so I can start getting this dang thing back together because Ive had it so long its turned to a wedding gift to my son.
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post #2 of 10 Old 08-11-2019, 04:43 PM
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Re: This embarassing, hope its right anyway.

If it looks stupid but it works, it isn’t stupid.
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post #3 of 10 Old 08-11-2019, 04:52 PM
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Re: This embarassing, hope its right anyway.

Hello – Very interesting engine you have there. Looking at the pictures it looks like you have the springs installed correctly, but what seals the head end of the tubes that the springs go into? There does not appear to be a sealing surface on the head to mate with the end of the tube – which looks like it is precisely made to seal against something.

This is all new to me. What year and what Gravely is it out of? Looking at the orientation of the parts, does it have two camshafts? Would love to see more pictures and see how it all goes together. Good luck!
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post #4 of 10 Old 08-11-2019, 06:11 PM Thread Starter
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Re: This embarassing, hope its right anyway.

Its a 1966 L model, and the springs go down into the round shafts ( my jug is up-side down in pic) & I have a new jug to engine gasket where piston connects on to the piston rod.
Lemmie find some pics to try to explain it. I dont know enuf or know proper description words to "splain" it either lol!
Well all pics are totally together or apart as they are now but as I took it apart I will connect piston to piston rod and turn the jug over and compress already on the piston rings as best I can and as I do that the valves/springs will go down into those towers as I call them and that part should be done with head going on next.
My tractor is a 6.6 H.P. but I installed too long head bolts and messed up head and cooling fins on it so I took the jug off a spare parts 7.6 Gravely ( LI ) I have , and the reason I had to remove old piston was because my 6.6 was bored .030 over and spare cyl & piston is standard. A real mess for a novice at best.
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post #5 of 10 Old 08-12-2019, 10:37 PM Thread Starter
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Re: This embarassing, hope its right anyway.

Quote:
Originally Posted by pfreiburger View Post
Hello – Very interesting engine you have there. Looking at the pictures it looks like you have the springs installed correctly, but what seals the head end of the tubes that the springs go into? There does not appear to be a sealing surface on the head to mate with the end of the tube – which looks like it is precisely made to seal against something.

This is all new to me. What year and what Gravely is it out of? Looking at the orientation of the parts, does it have two camshafts? Would love to see more pictures and see how it all goes together. Good luck!
I found one that should explain it better in a pic form, thats what I need to understand something. Should go with what I said in last post to you anyway.
Take Care
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post #6 of 10 Old 08-13-2019, 06:37 AM
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Re: This embarassing, hope its right anyway.

Quote:
Originally Posted by pfreiburger View Post
Hello – Very interesting engine you have there.
The gravely "T-head" engine is pretty cool. It was only ever used on gravely L models and their derivatives, being part of the tractor integrated system. One of the things that works so well about it is that it's massively torquey. It displaces something like 29 ci, but was designed to run at low speeds. Rating 7.6 hp max. It doesn't rev, but it pulls down to a few hundred RPM.

There's a fair bit of information around about the machines, including the engine. See for instance https://www.gravelymanuals.com/pdf/Model_L_IPL_0463.pdf

Scroll down a page, and you'll see an exploded view of the engine.

'41 L (not running)
'43 L
'44 L
'50 L
'52 L (not running)
'58 LI (not running)
'59 LI
'61 LS
'61 LS
Mutt LS
'62 LI (not running)
'63 L8
'66 L8
'66 C8
'67 C8
'74 Comm 12
'75 C8
'73 812
'74 816
UFT Mountaineer 88E
3 parts/project tractors
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post #7 of 10 Old 08-13-2019, 09:46 AM
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Re: This embarassing, hope its right anyway.

If you lookup old engines on the web (80-120 years old) the Gravely strongly resembles early motorcycle/bike engines in the overall design. It is amazing that a design nearly 100 years old was used with very little change from the 1920's to the 1970's. And is still going strong with all our tractors still running and working, thanks to the suppliers who are still offering replacement parts.
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post #8 of 10 Old 08-13-2019, 07:39 PM
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Re: This embarassing, hope its right anyway.

Quote:
Originally Posted by jrd View Post
The gravely "T-head" engine is pretty cool. It was only ever used on gravely L models and their derivatives, being part of the tractor integrated system. One of the things that works so well about it is that it's massively torquey. It displaces something like 29 ci, but was designed to run at low speeds. Rating 7.6 hp max. It doesn't rev, but it pulls down to a few hundred RPM.

There's a fair bit of information around about the machines, including the engine. See for instance https://www.gravelymanuals.com/pdf/Model_L_IPL_0463.pdf

Scroll down a page, and you'll see an exploded view of the engine.
Thanks much for the pictures and information, it's all very interesting - I saved the manual to look through later. You are right, that is quite an engine. Those valve head diameters in relation to the cylinder bore make most small engine valves look like nails! I have always been fascinated by Gravely tractors, as their engineers seem most often to have blazed their own trail. If I get the extra shop space I am working on getting, maybe a Gravely should be a future project. Cheers!
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post #9 of 10 Old 08-13-2019, 10:15 PM Thread Starter
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Re: This embarassing, hope its right anyway.

Quote:
Originally Posted by nhgravely View Post
If you lookup old engines on the web (80-120 years old) the Gravely strongly resembles early motorcycle/bike engines in the overall design. It is amazing that a design nearly 100 years old was used with very little change from the 1920's to the 1970's. And is still going strong with all our tractors still running and working, thanks to the suppliers who are still offering replacement parts.
I cant remember wich one its called but I used to call one of the old-OLD Harley heads a "Gravely Head" lol
It had cooling fins on the heads itself. Maybe a Knuckle head, but I honestly dont remember because back in those days we were all about speed and the 900 Kawasaki just came out somewhere about 71 or 72 and they would fly and back then nothing could catch them and Harley was owned by that sports equipment company AMF and I love harleys and would cut off my arm to have one but they werent doing that good when AMF had them.
Its my understanding the original family threw-in and bought the company back and the rest is history...again.
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post #10 of 10 Old 08-13-2019, 10:26 PM Thread Starter
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Re: This embarassing, hope its right anyway.

Quote:
Originally Posted by jrd View Post
The gravely "T-head" engine is pretty cool. It was only ever used on gravely L models and their derivatives, being part of the tractor integrated system. One of the things that works so well about it is that it's massively torquey. It displaces something like 29 ci, but was designed to run at low speeds. Rating 7.6 hp max. It doesn't rev, but it pulls down to a few hundred RPM.

There's a fair bit of information around about the machines, including the engine. See for instance https://www.gravelymanuals.com/pdf/Model_L_IPL_0463.pdf

Scroll down a page, and you'll see an exploded view of the engine.
Oh I use the 'sticky's free manuals' page like crazy, without them I would be totally in the dark.
I have to have blow-ups like in them to really understand them.
Your'e right they are good to have indeed.
That pic in the last post is the 6.6 still intact and all Im using from that is the head because the rest of it came from my parts LI 7.6, the jug, piston (STD bore), valves, springs and all, pretty much from the piston rod up.
The 6.6 was bored 0030 over so I aint ( or cant) use it in the 7.6 jug.
You mentioned awhile back you would like to have a 30 over piston & jug well Im not above just givin it to you, I dont need it and youv'e helped me so much I'd do it in a heart beat.
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