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520h overheating

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New wheel

I have heard these onan motors run hot. I read on here some time back some modifications to sheet metal can help. Could someone offer the details of that or any other modifications? Still haven't figured out how to post pictures on here. I'm not a counter guy.

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varosd

Here is a mod done by Jay in NC. It works great on my 520 and would like to do one for the 416.  some folks have just taken a bimetal hole saw and gone to town!

 

photo1-1.jpg

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Theroundhousernr

From what I gather. These engines run hot from grass clippings and gunk built up in the coolings fins and flywheel screen of these engines. This is first and foremost and will lead to quick failure , more then likely, a valve seat. If this is all kept clean , you should be ok with average use. However , things do block the airflow across the rear cylinder , like oil filter , belt guard and lack of oil filter gasket where air makes its way past instead of through the cooling fins.

 

  Things have been done to help remedy these areas from easy to more involved

- Order a new oil filter/shroud gasket

- drill holes or louver the belt guard around rear cylinder area 

- relocate oil filter

 

  All these mods are focused around the rear cylinder because this is where most problems turn up. I found when cleaing my newly purchase 520h engine shrouds , most all grass clipping where found in the rear cylinder. I beleive this is due to the air blockage of the above mentioned areas and causes a dead air space where grass settles. Also didnt help that I had an oil leak and was acting as an adhesive for the grass to cling to.

 

  Kyle

Edited by Theroundhousernr
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Theroundhousernr

Hey Don, thanks for the photo. I love that mod and I have been trying to contact Jay to see if he has any of those guards or if I sent him mine , would he get me fixed up? No luck in getting a response. Is this something he has shyed away from?

 

 

   Thanks Kyle

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Ed Kennell

Not high tech, but my vented belt guard really throws some heat.  I plan to box it into the cab next winter.

 

                                                                           post-7208-0-74900300-1396650040.jpg

 

This is what I found under the tin on my 1988 520H.

 

                                                                           post-7208-0-45418500-1396650289.jpg

 

                                                                           

                                                   

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HorseFixer

What we are dealing with is trying to get is Efficient Heat Transfer as Ed and Kyle mentioned Dirt and Blocked Fins grass clippings or whatever is the NO #1 thing that causes heat build up. :disgust: You can do all the Lover cutting fabrication or whatever you want and that stuff is miniscule and secondary if you cant get the air across these metal parts. :help:  After your engine is clean Yes by all means vent the Belt Guard with a louver. I have delt with Heat Transfer for 36 Years now as an HVAC contractor And the main thing we stress is Equipment being Clean whether it being a Condenser Coil, Evaporator Coil, A Blower, Or heat exchanger. Any part that comes in contact with heat that needs to be transferred away internally or externally needs to be clean these same principals apply to our engines. All the Engine tins that direct airflow over the heads need to be secure and in place along with the Gasket around the oil filter. :tools-wrench:

 

~Duke :wh:

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New wheel

Thanks for all the advice. I used to work in a sheet metal shop. That's some pretty thick metal to put louvers in. Who can do that? I am ready to paint all the major sheet metal parts on my 1988 520h. I always use air compressor to blow all my mowers off before I put them away. With all the shrouding don't know that is going to help. Everything is clean and oil free. Don't care for the looks of the multiple drilled hole deal

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cleat

This is my guard on one of my 520's. I will do the other one soon.

 

post-11822-0-25463400-1396707977_thumb.j

post-11822-0-87154800-1396707992_thumb.j

 

Cleat

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cleat

I saw this picture on the internet somewhere and saved it. Might be an option if you have no kids etc around to get their fingers in the belt.

 

post-11822-0-66047500-1396708169_thumb.j

 

Cleat

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shorts

what duke said, x2

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New wheel

Thanks again. I'm thinking maybe cut a rectangle out and spot weld a piece of expanded metal in its place? How do you post pictures?

Edited by New wheel

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Martin

I think I'm going to stock up on belt guards.....

With all you guys out there cutting them up, there ain't gonna be any good ones left......

Sent from my iPhone using Tapatalk

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leeave96

I may have asked this question before and forgot, but when you either louver or put holes in the belt guard, when you are out and about mowing on a hot day, do you toast your toes from the heat?

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Ed Kennell

Thanks again. I'm thinking maybe cut a rectangle out and spot weld a piece of expanded metal in its place? How do you post pictures?

Click on the MORE REPLY OPTION at the lower right in the reply to topic window.  Then follow the instructions.

 

Keep in mind ...however you vent the belt guard, keep it smooth on the inside where the belt may rub.

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Ed Kennell

I may have asked this question before and forgot, but when you either louver or put holes in the belt guard, when you are out and about mowing on a hit day, do you toast your toes from the heat?

We don't have grass to mow up here above the Mason Dixon....Only use our tractors to blow snow.   Yep, It keeps our right foot warm. :occasion-snowman:

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AMC RULES

Thanks for all the advice. I used to work in a sheet metal shop. That's some pretty thick metal to put louvers in. Who can do that? I am ready to paint all the major sheet metal parts on my 1988 520h. I always use air compressor to blow all my mowers off before I put them away. With all the shrouding don't know that is going to help. Everything is clean and oil free. Don't care for the looks of the multiple drilled hole deal

IIRC, Jay cut out, and welded an assortment of different vented panels in place on his modified belt guards...

louvers were just one of the options he offered at that time. 

Edited by AMC RULES

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Navig8r

I think I'm going to try one (or 2) of these: 

http://www.westmarine.com/interior-vents/west-marine--louvered-3-hose-vent-black--280829

 

I looked at it in person, and it would be easy to cut off the 'tube' part that protrudes from the back of the louver.. since it is flanged, with holes for screws, it would be easy to mount, and IMO wouldn't look too 'homemade'  (Not criticizing others work AT ALL... I like all the ideas here to make things work better, just throwing my idea into the ring)

 

OR maybe one of these... I have to check these out too:

http://www.westmarine.com/west-marine--louvered-ventilators--P000282320

Edited by Navig8r
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AMC RULES

I like the square one's...sure can't beat the price, or ease of application. 

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Navig8r

I like the square one's...sure can't beat the price, or ease of application. 

That was exactly what I was thinking.. The cutout underneath wouldn't even have to match... could just drill a pattern..... just paint the area behind the louver, around any cutouts, black, and it will look OEM-ish.

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AMC RULES

Yep, good lookin' out...thanks for the link.   :handgestures-thumbsup: 

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buckrancher

keeping the motor and inside of the guards clean  will do more for you than cutting holes in the belt guard

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Navig8r

Heat transfer 

 

keeping the motor and inside of the guards clean  will do more for you than cutting holes in the belt guard

Heat transfer is DEFINITELY key!  But getting the warmed air away from the engine/head is important as well, and improving that ability sure won't hurt.  More than one factor can make/break the cooling ability of these engines, and even with no belt guard, a gunked up motor isn't going to cool adequately!

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Desko

Today I looked into this on my dads D-160 and put my hands in front of the heads to see how much air flow comes out which is not much this tractor doesn't have the original carb its off a p216 so the blower tube is not hooked up and I realized how much air comes out so I plugged it with my hand and then checks how much air flow come out and there is an unbelievable difference in flow. When I get my p220 all together I will block half the blower tube on mine.

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ericj

when i mow it only takes me an hr or less to mow so i don't think the vented belt guard would be necessary, now if i had to mow for a couple of hrs.........

 

 

 

eric j 

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