MCCULLOCH The official McCulloch thread

[lehman live edge slab]

This is it if Randy can use and it will work.

 

[heimannm]

The problem with using an early front tank saw for a 101 engine is the crankcase bottom (AKA stuffer) is built into the fuel tank and won't clear the counterweights on the crankshaft.



Later front tank models like the Super 250, 300, 380, 450, and 550 had a separate crankcase bottom piece. All of those models had some form of automatic pulse operated oil pump so you would have to make sure the crankcase bottom and the front tank would play nice together.


The 1-7X and 7XX models have the separate oil tank/bar mount that works with the different crankcase bottom pieces.



Putting a 91B into a MAC15 is a bit easier since they are both "non super" type engines. Problem there is the MAC15 intake is very restrictive.





Mark

 

[Mastermind]

I gave Definite Dave a Super 797 a few years ago. I'm try to see if he has done anything with it....and if not is willing to part with it.

 

[hacskaroly]

This is it if Randy can use and it will work.

That one looks to be in really good shape and would clean up well. Looks to be a lot less metal rot than on my 200!

 

[edju1958]

Can someone tell me what plug is used in the PM800? I got the saw today & it has a CJ6Y in it,which I don't believe is the correct plug.If I'm not mistaken,the DE80 used a DJ6J,or a DJ6.
The saw definitely has no spark,so I'm gonna try to find a non-running 610 & "borrow" the ignition module from it.The saw has great compression & was only missing a couple screws on the recoil.

 

[edju1958]

Well I didn't find a 610 that I could cannabalize the ignition module from,but I went through my parts tote & found a BN ignition module that I bought from maxthemacman a couple of yrs.ago & I instal;led that.I put a shot of fuel in the plug hole,installed a DJ6J plug in it & 2 pulls later it was running.I had to shut it off because the tank was empty & I didn't want it to lean out.It's a great running saw,but I can't get the manual oiler to work.Only a few drops of oil come out at the bar pad & I can hear it suicking air.I'll investigate the oiler tomorrow.It could just be a dirty screen.It's missing the outer bar plate & the bar adjuster assembly.

 

[edju1958]

I need some help here in figuring out why the manual oiler won't work.I pulled the cover off the oil tank yesterday & the automatic pump was securely in place & the oil pick up seemed to be in good condition with a clear pick up screen.When I push the oiler button I get very little oil if any at the pad & it's sucking air from somewhere as I'll get air bubbles at the pad.

 

[lehman live edge slab]

I need some help here in figuring out why the manual oiler won't work.I pulled the cover off the oil tank yesterday & the automatic pump was securely in place & the oil pick up seemed to be in good condition with a clear pick up screen.When I push the oiler button I get very little oil if any at the pad & it's sucking air from somewhere as I'll get air bubbles at the pad.

I wonder if the plunger seals for the manual oiler are flexing and letting air by

 

[heimannm]

Ed - I will presume we are still talking about the PM800?

There are 2 check valves in the oiler system, one is the disc under the manual pump and the other is a check ball (and spring) in the automatic oiler. If either of those are not functioning the oiler will not work.

To access the disc check valve in the manual oiler the tank has to come off, cover off the oil tank, and remove the two screws holding the manual oil pump down. One is tapped into the housing, the other has a nut (11/32") inside the tank. There were two different discs used and they have to work with the flange on the oil pick up hose. The thicker phenolic disc works with the thinner flange, the thinner aluminum disc work with the thicker flange.



Thin flange



Thick flange



To access the ball check valve in the automatic oiler you have to remove the automatic oil pump from the tank (should be one screw and the spring clip on a PM800). On the older pumps you could remove a screw from the top of the pump and take everything out. This is another version of a spring clip that attached to the top of the automatic pump to help press it firmly against the seal (gasket) at the mounting surface.



On the newer pumps there is no access to the ball and spring so you just have to shoot some brake or carburetor cleaner in the ports and the steel guide in the pump and hope it unsticks the ball.

Test the check valve by putting some oil in the inlet hole and working the piston manually. If everything is O.K. you will see the oil go down the inlet and back up the outlet. Inlet is on the left, outlet on the right. You can also test the check valve by applying pressure to the outlet side, is should hold 5-7 PSI, but just holding pressure will not tell you if the ball is stuck. If you apply pressure to the inlet side it will push the piston out.



Mark

 

[Mastermind]

Ed - I will presume we are still talking about the PM800?

There are 2 check valves in the oiler system, one is the disc under the manual pump and the other is a check ball (and spring) in the automatic oiler. If either of those are not functioning the oiler will not work.

To access the disc check valve in the manual oiler the tank has to come off, cover off the oil tank, and remove the two screws holding the manual oil pump down. One is tapped into the housing, the other has a nut (11/32") inside the tank. There were two different discs used and they have to work with the flange on the oil pick up hose. The thicker phenolic disc works with the thinner flange, the thinner aluminum disc work with the thicker flange.

View attachment 455355

Thin flange

View attachment 455356

Thick flange

View attachment 455357

To access the ball check valve in the automatic oiler you have to remove the automatic oil pump from the tank (should be one screw and the spring clip on a PM800). On the older pumps you could remove a screw from the top of the pump and take everything out. This is another version of a spring clip that attached to the top of the automatic pump to help press it firmly against the seal (gasket) at the mounting surface.

View attachment 455353

On the newer pumps there is no access to the ball and spring so you just have to shoot some brake or carburetor cleaner in the ports and the steel guide in the pump and hope it unsticks the ball.

Test the check valve by putting some oil in the inlet hole and working the piston manually. If everything is O.K. you will see the oil go down the inlet and back up the outlet. Inlet is on the left, outlet on the right. You can also test the check valve by applying pressure to the outlet side, is should hold 5-7 PSI, but just holding pressure will not tell you if the ball is stuck. If you apply pressure to the inlet side it will push the piston out.

View attachment 455354

Mark

You are a absolute wealth of knowledge my friend.