gearbox mounted compressor

[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

[Phil Waterman]

Hi Everyone

Can someone confirm my recollection that these transmission driven air pumps are not intended to operate full time? That the gearing is such that much above idle speed they are being badly overspeeded.

My memory is based on something in a manual, drivers handbook, or service bulletin which I can not lay my hands on at the moment.

Cheers Phil

Brought back one of these from the War and Peace Show years ago in my carry on luggage through Heathrow. Trouble going through security at that end and customs at this end. They do look strange on the luggage xray.

[Jacques Reed]

Good Day All,

The attached should answer all questions on where the oil goes in lubricating a transmission driven tyre pump.

Taken from Ford "Special Pattern Vehicles" book. Note passage "A" and wick and non-wick versions and elbow oiler as mentioned by Lang.

The lubrication must be very slow as my pump, missing the oiler, sat for years on a working vehicle in my driveway. Never saw a drop of oil on the driveway under it.

Cheers,

[Jacques Reed]

Originally Posted by Phil Waterman

Hi Everyone

Can someone confirm my recollection that these transmission driven air pumps are not intended to operate full time? That the gearing is such that much above idle speed they are being badly overspeeded.

My memory is based on something in a manual, drivers handbook, or service bulletin which I can not lay my hands on at the moment.

Cheers Phil

Hi Phil et al,

Again, from the Ford "Special Pattern Vehicles" Manual they say bring engine up to 900 RPM or 16 MPH equivalent engine speed as per attached.

I agree, it sounds a bit fast but perhaps a later service bulletin countermanded that instruction. I never used mine, but if I did, I think nothing more than a fast idle would be the way to go.

Cheers,