Well after what seemed like an eternity we were finally able to get re-started on the 361 last weekend! We definitely had a great summer and wound up putting about 1000 miles on the 155W. I did get a lot of questions over the summer asking about progress on the truck so it’s really great to be working on it again.
When we last left off, the frame was just about ready to get painted. All we have left to do is torque the bolts and finish the 5th wheel mount.
If you remember, my buddy Mike painted the 155W and has been recruited to help on this project also. We were talking about spraying the frame when he had a minor catastrophic accident on his basement stairs and busted his knee. Since I figured he wouldn’t be able to spray too well hopping along on a crutch, I decided to start working on the motor instead.
When we bought the truck the engine wouldn’t turn over with the battery since the solenoid was stuck. So we pushed it with a fork lift and with just a little effort the truck started. Even with sitting for some time, the truck started on all 6 cylinders and had good oil pressure. From various stories we heard about the truck, we assumed the motor was fresh but the truck was taken out of service due to a bad frame (rusted & cracked…)
So here is what we started with this past Saturday…

The first thing we did was removed the inspection covers and everything looked pretty good…

After that we removed the valve cover and everything looked good...

At one time someone must have replaced the original stamped steel cover with this cast aluminum cover...

Based on how clean the engine was and a few conversations with Stephen L., we decided not to rebuild the engine, just clean it and reseal it as necessary. So one part at a time we start removing things from the engine. One of the first things we found was a busted thermostat... What temperature should we be running in this truck? 180 deg?

We needed some help with the engine so we brought my daughter Madeline out to the garage. She was too busy eating a cookie to help us though...

So after an hour or so worth of work we were down to this...

By the of the day we wound up with a work bench fully of parts...

We did find one interesting thing on this engine while working on it. I noticed there was numbers written in white crayon on the top of the bellhousing. I remembered Stan showing me numbers on the back of a Cat motor he had that matched the serial number of the truck.

It’s hard to tell from the pic, but the numbers are 77012. This doesn’t match our trucks serial number, but I remembered that Sears Oil had purchased three separate groups of 361’s, one group in ’70, one group in ’71 and one group in ‘72. So I checked my list, and sure enough 77012 was in the 3rd group of 361’s they bought in 1972.
Last but not least I wanted to removed the crank pulley. I was able to pick up a digital copy of the 671 Detroit manual on eBay for $10, so we started thumbing through the pages to determine how the pulley came off. The manual said to use a 2 jaw puller, but there was no good spot to grab the cast pulley without damaging it. So I wound up fabricating a tool using some ‘parts on hand’...

But after bolting the puller on and applying some pressure, I realized the puller was starting to bend...

Just to make sure I was on the right path trying to remove pulley, I talked to Stephen who confirmed that the pulleys are typically stubborn. So I let the puller sit on the crank for a few days and each night I would give it a squirt of PB Blaster. Then last night I gave the forcer screw a ½ turn and pop... it started to come off... After the pulley came off the damper also came off with just a little effort...

So that’s it for now... More to follow...