1.
>>I am hoping that someone on here can tell me exactly what I need.
This is not possible to answer without more information or a picture of the carb and cowling. Explanation below that you probably know already.
2.
>>And even better, where to get one?
Generally heater boxes are tough or impossible to get new or NOS. But even if a supplier had covers you need more definition to what you need.
3.
The reason is:
There are a few covers for the engine 159024D as you probably know. The parts breakdown lists two different heater boxes, two different carbs and two different cowling parts. There is only one carb called out on the parts list and one heater cover part number. Those do not cover the different carbs or heater boxes.
4.
The differences:
Heater box, carb and cowling on page 1.
Heater box, carb and cowling on page 7.
At issue are
- The primer.
- The throttle
- The choke
The page 1 carb:
The primer:
Does not show a primer arrangement.
The throttle:
The throttle is controlled from an assembly mounted on the side of the cowling. A rod goes from there to the carb throttle plate.
The choke:
Has choke knob connected to an L which runs to a loop at the top of the carb. The loop connects to the choke butterfly rod top which has the butterfly attached inside the throat. The choke knob end is mounted to the L which goes through a hole in the heater box at the handlebar side of the heater box cover.
The page 7 carb:
The primer:
The primer is a push/cover type. There is a button connected to a rod with a plate mounted. When you push the button the cover goes over the throat opening. To get prime you push the button and pull the start rope. On the intake stroke some gas will be sucked up from the carb bowl for priming. The button comes out of the heater box at the side facing the handlebars.
The throttle:
The throttle arrangement is a bit fuzzy on this page. It shows a plate on the right side drawing in the lower left section. That plate is usually used with a cable for a dash mounted throttle control. The cowling does not have the usual throttle assembly. The assembly lists two types of control brackets. They seem to be a throttle type that is full on or full off and unlike the usual throttle assembly found on Tecumseh winter engines. I think this is for some specific application and not a snowblower.
The choke:
The heater box shows a side slit. That’s for a choke lever which has a right angle bend so it can go to the side and through the heater box slit.
5. What can be done?
You can’t order by part number or order sight unseen because of the differences. You probably won’t be able to locate a new one or NOS anyway.
You’ll probably have to pickup a second hand heater box and modify it for your carb and muffler. (This engine came with a few different mufflers and air filters which will go with different heater cover arrangements).
This is all not a big deal. What you have to look at are the:
1.The cowling to tell the throttle type or if you have the plate on top of the carb which accepts a cable end for a dash mounted throttle cable.
2. The primer. Did your carb come with a button push type with the cover for the throat? Many second hand engines have this part missing. It’s an extended U shapped bracket that has mount points for the heater box screws and a hole in the center for the push primer rod to go through. You can order these parts or get them from a second hand carb.
If your carb came with a primer port for a rubber air hose and not the push button type then you can buy a rubber primer bulb and hose and mount it to the cowling.
3. See what choke your carb has. It can have a rod which sticks up straight from the carb body, have a right angle bend in the lever which runs to the side through the heater box slit or a loop at the top of the carb for a knob type like explained above.
Look at what you have then get a second hand cover and cut holes as needed to accommodate what you have for a carb and throttle arrangement.
Since what you have for a cowling, throttle type, primer type and choke type is unknown it’s not possible to say exactly what cover you need. The starting point for getting a second hand cover is to note the muffler type. The heater box usually mounts with 2 side screws on the side, one screw at the top and one to the front by the crank. The top and the front screws are mostly in the same place so the holes in heater boxes the same. The two screws at the side can be a few places depending on the primer but those can be drilled. The fit problem is a cutout for the muffler type. That can be cut to accommodate the muffler type also. Sometimes there is a 2 inch space when modifying a carb heater box for an L bend muffler versus a vertical non L muffler. That does not affect the performance in cold weather and can be used as is.
The last thing is cutting a new hole for the choke type. That will be either a slit or a new hole at the top or back end by the handlebars.
This is tough to describe but when you look at your carb it will be obvious what you need and can buy a cover which comes close enough to modify. A picture of your carb and cowling would helpful as without it’s a guess as to what you have and need.
Occasionally I get machines with missing heater box covers. The easiest thing is get a junk cover and modify it for your carb, throttle and primer. You bought a new carb and would not get parts with it for you engine if they are missing in your original setup. A picture of what you have would be make it a bit easier than guessing what you have.
