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  1. #1
    Silver Member
    Join Date
    Feb 2009
    Posts
    224
    Location
    south western michigan
    Tractor
    pt 425, JI Case, Gravely Comm.10A

    Default engine heat shields

    how critical is it to keep the heat shields on air cooled engines? every spring I take mine off the Subaru engine and evict at least two families of mice and other foreign matter, seriously contemplating leaving the heat shields off so mice/rodents have nowhere to build nests and hide, but concerned I would reduce the cooling of the engine by the flywheel, opinions? facts?

  2. #2
    Veteran Member
    Join Date
    Mar 2010
    Posts
    1,244

    Default Re: engine heat shields

    Take the cooling tin off a old Volkswagen and see how far you get. Those things are there for a reason. If not the accountants would have cut the costs and left it off. Clean it but replace.

  3. #3
    Elite Member BobRip's Avatar
    Join Date
    Sep 2004
    Posts
    4,247
    Location
    Powhatan Va.
    Tractor
    2000 Power Trac 422

    Default Re: engine heat shields

    I believe that the "heat shields" force the air around the fins on the cylinders and cool them. I think of the as air focusers.
    Bob Rip
    Tell me and I will hear.
    Show me and I will see.
    Let me do and I will learn.
    Let me fail and I will understand.

  4. #4
    Epic Contributor MossRoad's Avatar
    Join Date
    Aug 2001
    Posts
    23,685
    Location
    South Bend, Indiana (near)
    Tractor
    Power Trac PT425 2001 Model Year

    Default Re: engine heat shields

    I'd say they are pretty important. Its also important to run air cooled engines at their manufacturer's recommended RPMs. The fan on the engine pushes air around those heat shields to force cool air in and hot air out over the cooling fins. Not enough air movement causes undue wear on the engine.
    MossRoad

    Click On My Little Tractor
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  5. #5
    Veteran Member
    Join Date
    Apr 2012
    Posts
    1,525
    Location
    Northern Ontario, Canada
    Tractor
    2012 Kioti CK27HST w/cab

    Default Re: engine heat shields

    Mice do not like moth balls! Think about it.

  6. #6
    Gold Member
    Join Date
    Sep 2006
    Posts
    349
    Location
    Owego, NY
    Tractor
    PT422 w/ EH72FI engine swap

    Default Re: engine heat shields

    I had a family of mice build a nest on top of 20 or so fresh moth balls I placed in my ATV's airbox this winter... The mice around here just don't care about any of the deterrents I've bought and/or made.

    Regarding the "heat shield" question, are we talking about the plastic shroud around the engine (rear side in PT 42x)? I have the same mouse issue and I'm thinking about modifying the shroud so it can be removed more easily, but still retain most of it's air flow related properties... I have an extra one from the original EH65 I pulled out, so I should be able to use it as a test.

  7. #7
    Elite Member BobRip's Avatar
    Join Date
    Sep 2004
    Posts
    4,247
    Location
    Powhatan Va.
    Tractor
    2000 Power Trac 422

    Default Re: engine heat shields

    Quote Originally Posted by KMA View Post
    I had a family of mice build a nest on top of 20 or so fresh moth balls I placed in my ATV's airbox this winter... The mice around here just don't care about any of the deterrents I've bought and/or made.

    Regarding the "heat shield" question, are we talking about the plastic shroud around the engine (rear side in PT 42x)? I have the same mouse issue and I'm thinking about modifying the shroud so it can be removed more easily, but still retain most of it's air flow related properties... I have an extra one from the original EH65 I pulled out, so I should be able to use it as a test.
    I would love to see pictures of that. That area needs cleaning periodically and it is difficult to get into as is.
    Bob Rip
    Tell me and I will hear.
    Show me and I will see.
    Let me do and I will learn.
    Let me fail and I will understand.

  8. #8
    Veteran Member
    Join Date
    Mar 2007
    Posts
    1,161
    Location
    Bay Area, CA
    Tractor
    Power Trac PT1445

    Default Re: engine heat shields

    FWIW: I didn't have much luck with mothballs, and then a friend suggested cigarettes. Never had a mouse nest after that. Apparently, they are supposed to loathe the smell of tobacco. A single cigarette broken in half seems to do it.

    And, yes, the shields are vital. As is running it on the right gasoline; both contribute to adequate cooling.

    All the best,

    Peter

  9. #9
    Veteran Member
    Join Date
    Jun 2006
    Posts
    2,122
    Location
    West Cascades Washington State
    Tractor
    PT 422

    Default Re: engine heat shields

    I've had good luck with dryer sheets for mice.

  10. #10
    Gold Member
    Join Date
    Sep 2006
    Posts
    349
    Location
    Owego, NY
    Tractor
    PT422 w/ EH72FI engine swap

    Default Re: engine heat shields

    We had a nice sunny day, so I decided to modify my engine shroud to allow easy access for cleaning. I ending up finding a big nest, some chewed wires and dead mouse. The smell when running was terrible, and it was much improved afterwards. Of course it will also help with keeping the engine from overheating. I looked at my old engine as a reference and used a dremel to cut across the shroud. The line I used allows the screws to hold things in place even after it is cut. There are two relatively close screws on each side of the engine, and the line passes between them. It doesn't affect the air flow in any noticeable way, and now it is very simple to remove the top section and get inside. Here are some pics:

    Pic 1
    Pic 2
    Pic 3

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