richmondred01 2,307 #1 Posted April 2, 2019 I went with a different design on this 520. I’m not sure which one I like better. What say you? 6 1 Share this post Link to post Share on other sites
AHenry014 127 #2 Posted April 2, 2019 I like the slots better, matches the slots in the exhaust heat shield and looks less out of place. 3 Share this post Link to post Share on other sites
WHX?? 51,920 #3 Posted April 2, 2019 But both look pretty clean. What did you use to punch them? Share this post Link to post Share on other sites
richmondred01 2,307 #4 Posted April 2, 2019 (edited) The pattern is laid out and each hole is drilled with an industrial diamond hole saw. Edited April 2, 2019 by richmondred01 1 Share this post Link to post Share on other sites
dkg520 527 #5 Posted April 2, 2019 Both look great! Share this post Link to post Share on other sites
Lee1977 7,232 #6 Posted April 2, 2019 I don't thing the belt guard has anything to do with the valve seat problem. It's the engine cover and the cooling fins along with along with the dust and oil from changing the oil filter. A remote oil filter would be a better fix, just don't know where you could locate it. Share this post Link to post Share on other sites
kasey54 305 #7 Posted April 2, 2019 Id have to toss a coin. I like them both a lot. Share this post Link to post Share on other sites
JAinVA 4,638 #8 Posted April 3, 2019 Both look equally good.I took mine one step further and sawed off the guard mount.This actually decreases blockage more than the solid belt guard because of the deflector under the cylinder. 1 1 1 Share this post Link to post Share on other sites
Ed Kennell 42,229 #9 Posted April 3, 2019 I drilled mine. If I had the tools, I would have punched louvers and deflected the heat to the rear. With the holes as they are, the temp in the cab stays 30 degrees warmer than the outside temp. 2 2 Share this post Link to post Share on other sites
JAinVA 4,638 #10 Posted April 3, 2019 (edited) I have seen since I have started visiting here there has been strong opinions about whether this mod helps with valve seat issues on the Onan or not.Everyone has an opinion on that but two facts are not in dispute,Rear cylinder airflow is increased and it makes monitoring for blockage and cleaning easier. Edited April 3, 2019 by JAinVA 2 Share this post Link to post Share on other sites
richmondred01 2,307 #11 Posted April 3, 2019 I agree. I have at least 8 belt covers. I can always switch back an forth. i may make a few more with different styles and patterns. 3 Share this post Link to post Share on other sites
BESTDOGEVER 218 #12 Posted April 3, 2019 The gunk under the tins is part of the problem but if you look at how a Kohler fits on the frame it will convince you that opening up the belt guard is not a waste of time. That back cylinder sits about 3 inches further into the cover and the onan runs much warmer than the Kohlers do. 1 Share this post Link to post Share on other sites
WHX?? 51,920 #13 Posted April 3, 2019 (edited) 30 minutes ago, Ed Kennell said: I drilled mine. If I had the tools, I would have punched louvers and deflected the heat to the rear. With the holes as they are, the temp in the cab stays 30 degrees warmer than the outside temp. Thoughts exactly Ed, dedicated cab tractor or if not swap it out for a summer guard. 21 minutes ago, JAinVA said: I have seen since I have started visiting here there has been strong opinions about whether this mod helps with valve seat issues on the Onan or not.Everyone has an opinion on that but two facts are not in dispute,Rear cylinder airflow is increased and it makes monitoring for blockage and cleaning easier. Same thought here Jim and Best Dog... figured it can' hurt. Sides it just looks nice! Edited April 3, 2019 by WHX22 2 Share this post Link to post Share on other sites
JAinVA 4,638 #14 Posted April 3, 2019 (edited) I lost my c120 due to grass clippings lodged in the tins.At the time I had no idea they were there and the resulting fire scared the crap out of me since I had just fueled up.I do believe that any engine used can have some issues if you don't know what to be careful of.You can believe I pay attention to build up and hope you guys can learn from my error. Edited April 3, 2019 by JAinVA 2 Share this post Link to post Share on other sites
Ed Kennell 42,229 #15 Posted April 3, 2019 Obviously anything you can do to reduce the temperature of the rear cylinder is a good thing. The base the oil filter screws into is prone to leaks. It is only fastened by two small bolts and has a very narrow gasket area. If there are any oil leaks at all, the oil is blown across the cooling fins and every blade of grass sucked in by the fan sticks to the fins. The other problem I see is the missing grommet that seals the oil filter to the tin shroud. 3 Share this post Link to post Share on other sites
Lee1977 7,232 #16 Posted April 4, 2019 Due to all the Electrical Gremlins that older 520's have, I haven't got it to run long enough to get hot. Have parts ordered maybe next week. Ran good until I cleaned all the dirt out of it. Then It stop making electrical contact. Share this post Link to post Share on other sites
Ed Kennell 42,229 #17 Posted April 4, 2019 Here is a pic of my vented belt guard, the heat collector, and the F/R foot control pedal. All necessities for a snow machine. The cab stays 30 degrees warmer than outside temp. I am removing the blower and installing a 48" blade as I haven't used the blower for 3 years....next winter ????? 1 Share this post Link to post Share on other sites
