gearbox mounted compressor

[Lang]

I just had a look at my box of pumps. I have about 8 of them Chevrolet and Ford. No two are exactly the same and none of them has a name plate. Some cast iron and some alloy.

The plug in the bottom is just a hole for an oil can. Most have a right angle fitting with a little tin flip lid. The one in question has a spring loaded tin lid but coming straight out.

I think so long as there is about an inch of oil in the bottom all will be well as that is the height of the tin lid oiler. If gearbox oil does come along the shaft it can not fill the pump crankcase as it will just leak out the oiler fitting to maintain the correct level.

Quite apart from that there would not be a CMP in ten thousand that used its air pump sufficiently to wear it out when you consider early air brake trucks had similar compressors running continuously for thousands of hours.

Just an observation in my collection are two pumps mirror image to the CMP ones. This gives the option of fitting a pump with the head forward or back to clear chassis rails etc or on the opposite side of the gear box (does not matter which direction they turn) so a winch or hydraulic/mechanical tipper power take off can go on the other side. I had a Dodge WC53 with a winch take-off one side and a compressor identical to a CMP model on the other.

Lang

[Lang]

blitz pump oiler

Here is the oiler on 3 of my pumps. There are two which have no place for an oiler. I looked in the Chevrolet book and they say no maintenance on the pump because it is lubricated from the gear box. In other words they expect oil to go through the bush into the pump crankcase. If it goes higher than the gearbox oil level it will track back into the gearbox by gravity.

Lang

[Mike K]

Were the earlier cab 11/12 vehicles fitted with air pumps ? I ask because my C8 has a tapped hole and plug in the floor where the pump on/off rod would normally be located . I looked into fitting a pump in the C8 but its not easy, because there is a cross member in the way that fouls the pump . Not sure about the larger types 15 cwt and so on.

[Grant Bowker]

I have always understood that Chev pumps mounted on the left of the transmission and Ford on the right, both pointing to the rear. I haven't tried to see if the gears would mesh correctly if pumps are swapped from side to side.
In the Canadian context, and for Chev cab 13, there is only one threaded plug / opening in the floor to reach the pump's actuator shaft. Again, I haven't run a trial to see if all pumps would line up.
I believe all Chevs used very similar transmission mounts. At least the C8A, C15A and C30 up. I'm not as sure about the 2 wheel drive C8 and C15 but would guess they used similar bellhousing and thus mounts so would all suffer similar clearance issues. The 270" engines were mounted differently, whether in C60X or armoured vehicles but locations were similar.

[Lang]

Grant and Mike

Maybe the C8 could have a Ford pump fitted because it would face the opposite direction and possibly clear the obstruction.

The hole pattern and gears appear to be standard SAE dimensions and direction of rotation makes no difference.

Lang

[Mike K]

Originally Posted by Lang

Grant and Mike

Maybe the C8 could have a Ford pump fitted because it would face the opposite direction and possibly clear the obstruction.

The hole pattern and gears appear to be standard SAE dimensions and direction of rotation makes no difference.

Lang

Hmm interesting idea.

BTW the Morris CS8 you drove around collecting sand as a kid on the island, these have a generic SMITHS tyre pump ( fitted on many UK trucks ) on the gearbox side, there is a rod through the wood floor , you pull the ring up to engage the pump . There is a air filter for the pump mounted on the chassis rail , I pulled one apart and it's stuffed full with raw cotton !

[Harlé Sylvain]

Hello
Thank you all for your interesse

There is no problems with my bushings ,they are not worn at all.

I will try to find a oiler, and mount it on a angle on the compressor.

I will cross my fingers and hope that the oil stays in the gearbox.!

Thank you again

Sylvain