Vurge 158 #1 Posted August 14, 2020 My 656 project is coming along. Slowly to be sure, but progress is being made. RustOleum has been sprayed and a 212cc Predator engine mounted.... And then I decided to complicate things. Crammed a golf cart starter generator under the hood so I can have a charging system with enough power to run a 12v sprayer. The starter generator is about 1/2 the size of the Predator! Fingers crossed that I can make this work. Now it's time to make a belt guard. I know the drive belt has to contact the guard right after it leaves the pulley kwhen the clutch pedal is down). Does it touch anywhere else? 2 2 Share this post Link to post Share on other sites
Tractorhead 9,064 #2 Posted August 14, 2020 (edited) It just have a Tap on the lower side, close to the pulley. I hope it can be seen good enough on the Pict. Edited August 14, 2020 by Tractorhead 1 Share this post Link to post Share on other sites
ebinmaine 67,274 #3 Posted August 14, 2020 If your going to be fabricating a guard try to get as much of the lower side of the belt to contact as practical. The belt guides on a Tecumseh are actually on the engine in the form of small "loops" of 1/8" wire that are held on by a bolt, then bend out and away from the block. It's also possible that in order to stop the belt a second "shelf" will need to be added inside the guard to keep the top of the belt from sagging. If needed, that one could be located 1/2" or a little more below the position of the belt as the clutch is out. (Belt tight). 1 Share this post Link to post Share on other sites
wallfish 16,985 #4 Posted August 14, 2020 This might help. Making "fingers to support the belt loop so it /clutches around the engine pulley will allow more tolerance for building a belt guard. Is that a raw rubber belt? You wand to use a cloth covered belt so it will allow the belt to slip/clutch in the pulley groove. 3 2 Share this post Link to post Share on other sites
953 nut 55,075 #5 Posted August 14, 2020 (edited) 2 hours ago, ebinmaine said: fabricating a guard try to get as much of the lower side of the belt to contact as practical. In addition to safety the belt guard stops the belt from moving when the clutch is down allowing you to shift without grinding gears. Many belt guards do have tabs at the engine end to help hold the belt on the engine pulley while it is slack. TOP BOTTOM Edited August 14, 2020 by 953 nut 1 Share this post Link to post Share on other sites
Pullstart 62,791 #6 Posted August 14, 2020 That S/G looks like it”s brand new. Care to share your source? Great idea using that to start a Predator and have a charging system too! 1 Share this post Link to post Share on other sites
Vurge 158 #7 Posted August 14, 2020 Thank you! Thank you! Thank you! You guy are awesome. This information and the pictures are exactly what I need. I've stared at a lot of belt guards and still couldn't figure out exactly what parts were in contact with the belt. I have the C-121 I just bought, but that belt/clutch is so tight it doesn't even release so I know it's not a good example. @pullstart I just picked the S/G off eBay for $70. The actual part number is 15421N. When I bought it, I wasn't sure where/how it would be mounted so I made sure to get a model that would work spinning in either direction. From what I understand, these are made so they would work with 2-stroke golf carts (engines run in forward/reverse instead of using a transmission). The bracket is also from eBay. Originally from Toyota Yaris. I just looked for an automotive bracket because the S/G is HEAVY! My 24" S/G belt is just at the end of the adjustment. I could probably go up a couple inches and get more clearance with the engine. 1 2 Share this post Link to post Share on other sites
Vurge 158 #8 Posted August 19, 2020 Follow up question: When engaged, is the belt touching any part of the guard? Share this post Link to post Share on other sites
wallfish 16,985 #9 Posted August 19, 2020 No, you don't want the belt touching/rubbing on anything while it's spinning. 2 Share this post Link to post Share on other sites
Vurge 158 #10 Posted August 19, 2020 Thank you. I think I understand how this is supposed to work now. Hopefully won't take too much trial and error putting it together.... 1 Share this post Link to post Share on other sites
Vurge 158 #11 Posted September 11, 2020 Making slow progress, but it's working. When I step on the pedal I can see the belt push off the bottom of the guard and come off the engine pulley! I'll probably end up putting expanded wire mesh between the two pieces of angle iron. But before that I've got to extend the guard around then S/G. Thanks for all the advice and information on the belt guard. 2 Share this post Link to post Share on other sites
stevasaurus 22,708 #12 Posted September 12, 2020 Something like this might help to make this work. When the tension pulley is in slack mode, the guard actually funnels the slack in the belt toward the engine pulley. This allows the in-put pulley on the transmission to come to a stop and you can now shift without grinding the gears. Check out these 1/4" wire guides that were used to help funnel the slack and still keep the belt in line with the pulleys. You might do the same thing with success. Adjust them to be about 1/4" from the belt. 2 Share this post Link to post Share on other sites
Vurge 158 #13 Posted September 13, 2020 I've got the bottom edge figured out, but fabricating the rest of the upper piece will take a bit more work. I think the wire guide might be the way to go. That'll be easy to fit around the S/G belt/pulley if I come in from the front. 👍 2 Share this post Link to post Share on other sites
