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In 25 years of driving my CMPs I have found the engines and trucks to be very reliable. In that they have broken down on me only a very few. Never have the trucks failed to the point of having to be towed home. Break downs include the following :
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 Here you can see the
simple design of the transmission.
Four speeds forward one reverse, with straight cut gears which makes double
clutching a requirement. |
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Top -The valve cover and side panel have just been removed from the engine no cleaning has taken place yet. Note that there is no sign of any sludge or dirt in the engine. This is one of the reasons that I believe the odometer reading of 6314 miles.
Bottom -The valve cover and side panel have just been removed no cleaning has taken place- but water coming from cracks are a bad omen of what is to be found. Again the mileage is low but the 8588.3 miles were hard miles
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1942 Pattern 13
1941 Pattern 12
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In the bottom view you can see the detail of the connecting rod scoops or dippers. The engine was in very good condition, compression was good and even once I had check the condition of the inside I replaced the cover gaskets and put it back together to test run extensively. No smoke or oil leakage every thing looked so good I cleaned the outside of the engine in place and painted it. Before cocooning it in plastic and starting on the chassis.
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 Layers of paint and cosmoline covered
many parts of the truck. As the cosmoline dried out it peeled the paint
off with it. But the wear on mechanical parts, very little and the very
low mileage on the odometer seemed to match. |
 The
nose goes back on once the chassis has been sand blasted and painted and
is going back together. BEAST lends a hand in moving heavy parts around.
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 The nose comes back off
and the engine has been pulled. It only took us about 4 hours to have
the engine out and upside  down to work on. |
  Once the crank was removed the cause
of the seal failure was evident the rear main seal surface was pitted.
Why this didn't leak when test run with out load is a mystery. The crank
was sent out and just a trace cut resurfaced it and all of the mains this
with new bearing inserts brought the crank back to spec. |
Three weeks later BEAUTY C60S and BEAST HUP at our summer rally. |
| The next major problem
for the C60 came after about 3000 miles and three years. A lose of power
returning from an event was the first sign of trouble. The coprate was
a burned exhaust valve in number six cylinder. It was interesting that
when I pulled the head the cylinder walls had no visible or measurable
ring ridge.
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The burned valve is a result of the new
unleaded gas from first sign of a leak to a very noticeable lose of power
was only 150 miles all happened in one trip. All of the exhaust valves
showed very noticeable recession. The valve clearance dropped to nearly
"0". |
| Over the ten year Beauty attended a great many events as well as logging some 12,000 miles only one breakdown on the road stopped the truck. That happened on our clubs 2004 Fall Foliage Run. The symptoms- POP BANG WA WA. This all happedn while running along at 50 MPH, down hill, trying to catch the rest of the convoy. After coasting to a stop I had an idea that something in the distributor had let go. Popping the distributor cap off I gave the rotor a twist and it turned. The problem was a broken pin in the distrubutor gear |  |
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New Engine Information and Overhaul Progress on the Pattern 12 |
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