Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

Sign in to follow this  
rickf

Allis 720 (powermax) Heat shield

Recommended Posts

rickf

Hi

Hoping to replace the mechanical fuel pump on my onan this weekend, was running fine, but depositing oil on top of the block. (do the electric fuel pumps run full time with the return line in place? - seems like there would be no resistance to shut it of intermittently.)

Anyway scouring the archives and the web for pictures I noticed several onans (cckb) that have heat shields on top. Mine did not come with one, but it seems like there are also plenty of pictures with them missing or not present. I don't see the part in the onan manual, but it is in the simplicity manual, (#176374). And I only have the Allis service manual, not the parts manual. Were these part of the original Allis setup? I can't say my carb has felt overly hot after using the tractor for a while, but still probably a good idea to keep the heat out. Any thoughts? Should I fab my own, or do these show up on ebay occasionally?

Thanks.

Share this post


Link to post
Share on other sites
AcFordHawk

The heat shield is from the factory. The mounting tabs crack and/or break at the manifold mounts or get removed to make working on the carb, fuel pump,etc, easier. I fabricated one. I have the drawings on digits somewhere.

picks 008.jpg

picks 009.jpg

Share this post


Link to post
Share on other sites
rickf

I wondered what the mounts in the manifold were for. If you have the drawings wo a lot of heartache to dig up, I'd love to 'borrow' them. made a heat rear shield for a vermont castings wood stove last fall, have the spare metal, and heat resistant black paint already...Thanks.

quote:Originally posted by AcFordHawk

The heat shield is from the factory. The mounting tabs crack and/or break at the manifold mounts or get removed to make working on the carb, fuel pump,etc, easier. I fabricated one. I have the drawings on digits somewhere.


id="quote">
id="quote">

Share this post


Link to post
Share on other sites
rickf

Looks like most folks have put them in in that fashion, though I see reports also of ditching the return line. I sort of assumed electric pumps weren't designed to run full time, (my experience with older cars) no worries with them running full out of premature wear? - of course the tractor probably sees minimal hours over the course of a year compared to a car...

quote:Originally posted by MPH

Yes, the electric fuel pumps run full time with a return line.


id="quote">
id="quote">

Share this post


Link to post
Share on other sites
Marty-MN

I used a Onan electric electric pump on my 620 and kept the return line. The pump starts fast at first and slows to a slow click when running and in a 6 or 7 hour day of tilling it only shuts of for fueling.

Share this post


Link to post
Share on other sites
michics

I've got the small Facet electric pump on my 720 without a return line.

It only generates 1-3 lbs pressure and works great on these engines.

Napa doesn't handle them anymore so skip them. Try Kirk Engines performance. He sells the correct one

www.kirkengines.com

Share this post


Link to post
Share on other sites
rickf

Paul was kind enough to forward his template for the heat shield - though it seems like most onan pics on the web seem to have it missing. Anyway, I converted it to a PDF should be the actual size, and a tiled version you can print off and tape together... Check the size when you print it though!

hmm looks like I can't attach pdf's here - anyone I can send them to to store on the site somewhere?

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this  

×