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  #841  
Old 30-06-20, 20:24
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So I drained down the radiator enough to remove the thermostat housing. The thermostat is a 160 deg one. It is operating fine and there was nothing causing an blockages. I did drill a tiny hole in though. Even having a hole is mentioned in the MB-C2 manual. I checked my original bellows style thermostat and it had the small hole. When I was reinstalling this I noticed that the fan pulley seemed to spin easily. Bingo.....the fan belt was very loose. I tightened it up to the proper 1/2Ē of play as mentioned in the manual. What a difference in how it sounded as you could really hear the fan pulling the air through the radiator now. I suspect that was my problem at the higher RPM the fan was slipping and not spinning the water pump as well as needed.

As for the speedometer, I pulled it out and the cable was fine. I think something either seized up or let go inside the speedometer. I put on the NOS spare I had.

I also pulled out my fuel gauge as it didnít seem to be working. I tried out the spare and it worked so it was installed. I also sanded all the paint off the rim on the dash panel to give it a much better ground. I then added new fuel to the tank and the gauge moved as it was supposed to.

I took the truck for a test drive around the block. Itís a 10km round trip. The truck got close to but never went over 200deg on the long sections of road. Today the weather temp is around 28deg and feels like 32deg. I did have it up to 40mph in some spots but it seemed to like crusing nicely at around 35mph. There is absolutely no wobble and the steering is very responsive.

Does anyone have a part number for Napa for a new fan belt? Iíve got the wide pulleys on the truck. There seems to be a few different sizes listed online. The one I have is very old and sits down in the bottom of the pulley. Itís looking a little chewed in spots.
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  #842  
Old 30-06-20, 21:43
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Jordan, you will be looking for a ďBĒ series fan belt, eg B52
etc.
If you remove it, auto parts stores have a jig for measuring up your belt to get you the proper size. Note you will likely want one a couple inches shorter than the old one due to the stretch
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  #843  
Old 30-06-20, 22:36
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The belts shouldn't stretch. You should be able to buy one the same size. That's what the measuring thing is for. They may wear on the sides. If the bottom of your pulleys are shiney, the belt is worn out or the pulley is worn out.
Interestingly Chris, the flat head v8 in the carriers take B52 belts as well.
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  #844  
Old 02-07-20, 02:11
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Well I did a Canada Day drive today. Round trip would have been about 100km. The truck drove great, well almost.....about 15km from home the fan belt let go. CAA and my dad to the rescue. Tow truck was on scene in about 25min and we were home in no time.

My wife, Vicki called it to. I said letís take the CMP for a drive, her reply was ďyeah Iím probably going to call a tow truckĒ. Well letís hope she called it with the lottery ticket she bought on the way home.
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  #845  
Old 02-07-20, 02:53
Bruce Parker Bruce Parker is offline
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And neither of you thought to use the old pantyhose replacing a broken fan belt hack? I'm glad nothing was broken!!

I got thinking about a loose fan belt causing overheating at speed and it makes perfect sense. As the speed increases so would the pressure needed to drive coolant through the water pump and the loose belt would slip on the pully reducing circulation.
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  #846  
Old 02-07-20, 03:02
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Yes nothing broken is nice. Tow truck dropped me off at home. Cut the old belt out, started up the truck and backed into the garage.
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  #847  
Old 02-07-20, 03:36
Harry Moon Harry Moon is offline
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don't let coming home on the hook discourage you. I've come home on a hook three times, actually one of those was to the destination where i fixed the contamination. The fan can overpower the belt, 6 blades moving a lot of air and if you are over 30mph we are past it's design speed. I use a 5/8 belt reasonably tight. the belt tension is a regular maintanence check item
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  #848  
Old 02-07-20, 04:22
Bruce Parker Bruce Parker is offline
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Quote:
Originally Posted by Harry Moon View Post
don't let coming home on the hook discourage you. I've come home on a hook three times, actually one of those was to the destination where i fixed the contamination. The fan can overpower the belt, 6 blades moving a lot of air and if you are over 30mph we are past it's design speed. I use a 5/8 belt reasonably tight. the belt tension is a regular maintanence check item
Back in the day I blew the transmission on my 60cwt Chev Machinery I (the one now at the Oshawa museum) in Arthur. Left it there and drove up the following weekend with a spare transmission. Installed it using my knee as the transmission jack. Got about 200 mosquito bites because both hands and my knee were busy aligning the splines on transmission shaft to the clutch. Drove it back to Scarborough. True story, I have photographs and witnesses.

Fast forward to yesterday.

My wife rented a car (VW Golf) and because of the two driver jockey dance she had me drive it home. Then in the middle of nowhere doing 115km/hr on the 401 bang woppa woppa woppa and a violent pulling to the left narrowly missing a car in the fast lane. Got well off on the shoulder to find the front right tire disintegrated. No problemo...there was a fully inflated donut in the back. Jack there too, but no wheel wrench. So I call the 1-800 'save me' number explaining the problem and my location to two different foreign call centres, and then a third time to the local contracted tow truck service. The tow truck dispatcher informed me I would have to find my own way home from the side of the highway because of covid social distancing rules. So there I am, a grown man broken down on the side of the highway unable to fix a simple flat. No matter, 3 hours later the defective VW was returned to the rental car place and because of all my trouble they upgraded the rental car my wife is now driving in comfort.
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  #849  
Old 02-07-20, 04:33
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Quote:
Originally Posted by Harry Moon View Post
don't let coming home on the hook discourage you. I've come home on a hook three times, actually one of those was to the destination where i fixed the contamination. The fan can overpower the belt, 6 blades moving a lot of air and if you are over 30mph we are past it's design speed. I use a 5/8 belt reasonably tight. the belt tension is a regular maintanence check item
No discouragement from me. Itís all part of the joy of vintage vehicles.

How does the fan overpower the belt?
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  #850  
Old 02-07-20, 05:29
Harry Moon Harry Moon is offline
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Default fan speed

the faster the fan goes the more horsepower it needs to move the increasing amount of air, just like losing tractions when you apply to much horsepower to the tires. more grip helps hence make sure you use 5/8 belts and pulleys. A fan unlike a car doesn't lesson the draw of horsepower when it reaches a certain speed it is uphill so to speak all the way.
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  #851  
Old 02-07-20, 05:43
Harry Moon Harry Moon is offline
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Default Fan belt

I use this belt and always have a spare with me. (I do run an alternator though)
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  #852  
Old 02-07-20, 10:42
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Jordan, was that a new belt or the one you burnt? Btw, there are better photos of Vicky.
Harry does that belt cross over to a B52? I like those belts as well.
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  #853  
Old 04-07-20, 02:50
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Vicki too know the picture as she has a great sense of humour. First she thought I was joking about having to shut down. Then when I actually pulled over and turned off the truck she figured I was no longer joking.

I stopped in the other day at Princess Auto to get a replacement belt. Iíd read online that the Chevy 216 needed a 42Ē belt. So I got two. Got home and they are too short. So after dinner I took them back and got three different sized ones. Well they were too long. It turns out I needed a 44Ē outside length one. Well that turns out to be the only size out of about 1 million sizes Princess Auto doesnít have. They had B40, B42. So off to the Home Hardware nearby that is unlike city Home Hardwares. They had name brand Dayco B41. Got home and it was a job to get it on but once on it fits great.

So Dayco B41 is what I needed.

The fitting issue I had with it was a sever lack of room and Iíve got the large pulleys on both the water pump and the generator. When I used a size larger belt it slid over the generator pulley but then there wasnít enough adjustment to tighten the belt.
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Universal Carrier MKI*, 1942
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Willys MB, 1942
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  #854  
Old 04-07-20, 04:23
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Jordan if itís any consolation, my first shake down drive in my 12 cab Ford left me stranded with an overheated coil on the dizzy.
Lucky for me I had another at the shop, so it was a case of hitch hiking back to town to retrieve some help and sole tools to do a road side repair.
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3RD Echelon Wksp

1968 M274A5 Mule Baifield USMC
1958 M274 Mule 2cyl (4cyl engine waiting for transplant!)
1970 M38A1 CDN3 70-08715 1 CSR
1981 MANAC 3/4T CDN trailer
1983 M1009 CUCV
1971 M35A2

RT-524, PRC-77s,
and trucks and stuff and more stuff and and.......

MLU, MVPA, G503, Steel Soldiers
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  #855  
Old 04-07-20, 16:39
David Herbert David Herbert is offline
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I have found a surprising variation in sizes between different makes of what were supposedly the same standard size belts. I am not talking 1/4" but up to two inches on a long belt when measured very carefully. It seems to be necessary to put a tape measure round a belt that fits properly and record the length, then measure any belt you buy before taking it home.

Wouldn't you think that they would be standardized in the real world rather than fairyland ?

David
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  #856  
Old 04-07-20, 16:50
rob love rob love is offline
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I went through the same thing with a few different vehicles, where Princess auto didn't have the exact size I needed. TSC had a very good selection and their prices were right on.

I'm not sure those belts from TSC and PA are meant for automotive applications. I think they are more for electric/gas motors driving equipment like pumps or fans. But for the limited use we will do, they hold up just fine.

The automotive ones are considerably more expensive. Price out what you want from NAPA and you will see what I mean.
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  #857  
Old 04-07-20, 21:43
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Rob, I think there is quite a difference in the way some belts are made. Some being "wrapped", while others are "cut".I think the cut belts are better quality? Then there is the industrial verses automotive, which is about width and angle differences. I do like those cogged belts.
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Carrier Armoured O.P. No1 Mk3 W. T84991
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Jeep Mb #135668
So many questions....
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