blower disassembly?

on a littlefield 1471 hh blower, after removing the front cover and gears, do you pull the front bearing plate off with the rotors still in it or is there a special tool to pull the plate off the rotors leaving them in the case to be pulled out after? I am not seeing anything to pull against to get the bearing plate off. thanks in advance for any info on disassembling this blower

 

You should be able to tap the bearing plate of with a rubber mallet leaving the rotors in the case, just depends how well stuck on the plate is.

 

Remove the rear bearing cap, using an alum round piece of stock and a dead blow hammer, drive the rotors and frt bearing plate out the front as a unit, then easily tap the bearing plate off the front shafts

 

hey Andy after all that fun stuff then comes timing the rotors could be interesting.dave

 

We had a plate that you could mount to the front of the blower. Pulled the gears and pushed the rotors out the back all in one process.

Your blower will last longer if you do not disturb the front plate.

Timing is no big deal...When we were doing them the marks/dots line up at 3 or 9....not that tough...and when facing the blower your rotors should look like a boat wake....they got out and away from you.

Take your time...freeze/chill your Teflon before you pull it through. Then tap the excess back in to take up the stretch...try to let it sit over night to settle if possible.


Kevin Hool
TAFC 7
tafc562@hotmail.com
http://www.kandkmotorsports.com

 

Why would you freeze /chill ? I was at SSI --- they have a saucepan with warm water in it --drop the pieces in for a moment --- pull them out of the water and they slide in easily --------

 

do not freeze your teflon, it reacts badly to extreme cold, on a cold day I put it in a tub of warm-hot water and pull it through, this also helps if the grooves seem tight, if you have any other questions regarding disassembly or re-assembly, please give me a call at the shop 714-992-9292 I will be glad to help you to make sure its done correctly, small mistakes can be very costly

 

thanks andy, taking the bearing caps off and pushing the rotors and plate out worked great. one more quick question. there is no gasket or o-ring between the bearing support and case. what do you use to seal it? it looks like it had that red gasket maker on it. thanks for your replies

 

We use a motorcycle case sealer, but any type of sealer will work, even clear silicone, spread it very thin

 

The statement that teflon reacts poorly to cold is not accurate. We've tested different teflons and many polymers at extreme cold. (I'll call them teflons because this is not a material science class) Some temperatures as low as -400f (-240C) and have seen no effect on the physical properties when resumed service at standard room temperatures or even higher.

However, Teflon does react to tensile loading's better when slightly chilled. Hence being pulled through a groove in a rotor. We tested this many times with various Instron equipment. With both new and fatigued product.

Opinions will vary on correct blower servicing but we used to get 25-30 runs on our Hampton/Davenport blowers at 50-55 even 65 over ...And they performed beautifully even when we were running against the screw blowers. .

As always, your mileage may vary. But one clear thing I discussed with Mert, Don, Norm, and Less and they all agreed upon was the more that front plate is disturbed the faster your blower is going to wear out, and the poorer it will perform. The case is going to move the minute you pull the plate, you will notice it being very tough getting the dowels back in the plate especially with a retro/front pie opening type case.

Also, all "Teflon" is not the same. Physical Properties can vary. Call around and ask questions and get samples. You will find different products that are cut differently also. You might want to stick with the product that is cut and prepared for the grooves in your rotors.

But find a blower guy you trust and stick with their recommendations.

This is always the danger of the Internet chat rooms. I was just relating my engineering, NQA1 auditing, and racing experiences with blower materials.

Have Fun,


Kevin Hool
TAFC 7
tafc562@hotmail.com
http://www.kandkmotorsports.com

 

not here to get our guns out but.....andy does all the blower work and machining at mert's shop iam not saying rite or wrong here but east is east I do a lot of blower work and andy has always been there for us. myself I like to take a pan of water on a small 110 pan warmer and warm up the teflons...its like clear plastic hose it works much easier warm than cold...with that said Andy knows more about blowers and baseball than I will ever know....dave Lowe