Burnerman 758 #1 Posted October 19, 2019 So I got a free (I gave the guy $10 so I didn’t feel like I stole it) 72 Commando 800. It’s been well used but someone had been keeping up on its service for the most part. I got it running fairly easily with a new battery and fuel line/ filter. I need to replace the head gasket, clean the carb and a few other things. The drive belt was pretty shredded and there was a bit of noise when you let out the clutch. I pulled the belt guard off today and found the belt had been running under the clutch stop tab. I measured the old one and it’s an 82”. I had a decent used 82” backup belt for my C101 in the garage so I put it on. It’s better but it seems too long. The backside belt rides the top and bottom of the belt guard when the clutch is engaged. There’s little to no clearance between the guard and the backside of the belt. Everything I find says this takes the 5L820 belt. Does anyone have any ideas? The belt size is about the only thing that one of the PO’s didn’t write down with marker on this tractor. 😁We changed the trans oil today too. Eww. It was mega think latte looking stuff. My son noticed the stickers on the new brake band. 😲 I may take a ride up to Dombrowskis and show them some pictures to see if they remember this one. 6 Share this post Link to post Share on other sites
rjg854 11,349 #2 Posted October 20, 2019 If you look in the manuals section and find the right manual the belt sizes are usually listed there without having to download the manual itself. 1 Share this post Link to post Share on other sites
Burnerman 758 #3 Posted October 20, 2019 10 minutes ago, rjg854 said: If you look in the manuals section and find the right manual the belt sizes are usually listed there without having to download the manual itself. I’ve got the manual. It calls for a 7473 belt which is a 5L820. That’s what I have on it. All of the pulleys are stock. It just seems too long. Share this post Link to post Share on other sites
The Tuul Crib 7,336 #4 Posted October 20, 2019 1 minute ago, Burnerman said: I’ve got the manual. It calls for a 7473 belt which is a 5L820. That’s what I have on it. All of the pulleys are stock. It just seems too long. Yep 5/8 x 82. 1 Share this post Link to post Share on other sites
troutbum70 857 #5 Posted October 20, 2019 If I can remember after church tomorrow to check in my little shop I should have the napa number as I replaced mine this passed spring. I am pretty sure tool crib is right on target 5/8 x 82 sounds very familiar. 1 Share this post Link to post Share on other sites
Burnerman 758 #6 Posted October 20, 2019 I ordered a new toro belt and idler. Maybe the belts are both just stretched but the backsides measured 82”. Share this post Link to post Share on other sites
ebinmaine 67,261 #7 Posted October 21, 2019 Check to see if the belt is sitting too low in a pulley. A worn pulley will cause a belt to be "too long". 1 Share this post Link to post Share on other sites
Burnerman 758 #8 Posted October 26, 2019 So, I had to do a 20 hr shift yesterday but I have too much tractor stuff to do. Lol. Home at 5 am and up at 8. i put the new belt, v idler and spring. I also checked my engine pulley and found the set screws were loose It still has about an 1/8th of an inch clearance to the belt guard. The new spring is MUCH tighter so there is a lot less slap. I got all the parts for the mower deck today and my son welded up the cracks around the one side spindle. I got it all together and tried to mulch up some leaves. I found out that I need to rebuild this engine too. Lol. It has a knock to it but I still haven’t cleaned the carb and replaced the head gasket. I’ll have to dig in deeper. 1 Share this post Link to post Share on other sites
ebinmaine 67,261 #9 Posted October 27, 2019 23 hours ago, Burnerman said: dig in deeper Are we sure it's a for real knock or not something simple like timing off or bad valve? 1 Share this post Link to post Share on other sites
Burnerman 758 #10 Posted October 27, 2019 I’m not sure at all. Lol. I know the head gasket is bad. I haven’t checked the timing or cleaned the carb yet either. Haha. It started up so easily. I’ll give it a good inspection and get it all good. 1 Share this post Link to post Share on other sites
Burnerman 758 #11 Posted October 28, 2019 Ok. Lol. I drained the “oil” today. Too much aluminum! I did get to chop up my leaves and found out this tractor fits my yard perfect! Super nimble. She’s gunna get a full engine overhaul! @ebinmaine I found the points set at .024. Prolly bee running advanced for awhile and the oil not changed enough. The deck cuts great so it’ll become my lazy lawn mowing tractor. 😁 1 Share this post Link to post Share on other sites
Burnerman 758 #12 Posted November 16, 2019 Pulled the head on the 800, in my new “tractor OR”. A lot of piston slop. Looks like someone has been in here WAY too much. There’s file marks on the block😳. The piston is stamped .003. The head is badly warped. The head gasket actually looks new. There’s no slop in the rod but it needs a bore and piston. I’ll try and measure it out tmw. 1 Share this post Link to post Share on other sites
Tach-a-matic 357 #13 Posted November 16, 2019 Great posts! How did you get the center double pulley off the mower deck? Share this post Link to post Share on other sites
Burnerman 758 #14 Posted November 16, 2019 22 minutes ago, Tach-a-matic said: Great posts! How did you get the center double pulley off the mower deck? Oh that came right off , it was a cast iron pulley. It was wallowed out bad. I couldn’t use it. The PO had actually wedged a shim in on the one flat to take up the slop. It wobbled bad. I found a NOS steel replacement. I really didn’t have any issues with any of the deck pulleys of this one. If you’ve got a stuck double D deck pulley the only thing I can recommend is a lot of penetrating oil and use a heat gun to warm the pulley to help draw the oil in. Heat and cool it a few times while soaking it. 1 Share this post Link to post Share on other sites
Burnerman 758 #15 Posted November 16, 2019 35 minutes ago, Tach-a-matic said: Great posts! How did you get the center double pulley off the mower deck? https://www.wheelhorseforum.com/topic/83850-36”-deck-rebuild/ This is the deck post. 1 Share this post Link to post Share on other sites
Burnerman 758 #16 Posted November 17, 2019 I got to measure the cylinder yesterday. It’s 2.943. The piston is stamped .003. Is this a factory oversized piston? I checked the head with a straightedge and it was warped right where the gasket was leaking. I had a good head in the garage to replace the one on the tiller that’s got a heli coil in the spark plug hole. I put that head on and a fresh gasket until I find a good shop to machine the block. Low and behold I guess I shoulda checked the block! It’s leaking in the same spot! I hope the block can be machined flat again. Share this post Link to post Share on other sites
Burnerman 758 #17 Posted November 18, 2019 Ok, I need a new torque wrench and drink less beer when working on tractors lol 🤭🧐I went to pull the head today to check the block and the head bolts were just more then hand tight. I did a compression test and I soaped the head to see where the leaks are and they were everywhere. 😂😂 Also during the compression test I put my new spark tester on the plug lead. I saw a great blue spark and then saw the huge yellow spark from the condenser case to ground. Tightened the head down good and replaced the condenser. Runs better now but still has the slight rod knock. We also dug into the V7 tonight and it’s prolly going to get repowered. 3 1 Share this post Link to post Share on other sites
ebinmaine 67,261 #18 Posted November 19, 2019 45 minutes ago, Burnerman said: 1. need a new torque wrench 2. drink less beer when working on tractors Answers: 1. Ok that may be... 2. Don't eeevven be so silly. 1 4 Share this post Link to post Share on other sites
Burnerman 758 #20 Posted November 23, 2019 Found a free engine for my sons V7. It’s gonna take a little bit to make it fit I think. 2 1 Share this post Link to post Share on other sites
pfrederi 17,659 #21 Posted November 23, 2019 Hoods are overrated 1 Share this post Link to post Share on other sites
Burnerman 758 #22 Posted November 23, 2019 9 minutes ago, pfrederi said: Hoods are overrated It almost closes. 😂. Well “massage” it on there. 1 Share this post Link to post Share on other sites
Lee1977 6,642 #23 Posted November 23, 2019 (edited) You might need a little more Horse Power. Edited November 23, 2019 by Lee1977 2 Share this post Link to post Share on other sites
Burnerman 758 #24 Posted November 23, 2019 If this works, I think we’ll call it “Excessive”. 1 1 Share this post Link to post Share on other sites
Burnerman 758 #25 Posted November 24, 2019 @ebinmaine has a Colossus we can try to be a “Little Excessive” it sounds better. @mrshaft696 built one, we can too This is gunna be a fun winter project. Share this post Link to post Share on other sites
