How To: Restore a Morris or keep fit

[pauldavies]

Thanks guys and much food for thought, the air/fuel mixture screw and the idle screw I have been trying to get some sense out of and I have stripped the carbi a few times and found blocked jets and worn gaskets. I did install electric fuel pumps on and that may be the problem, I don't have the holding tank but the manual fuel pump I can fit to try the theory. Will let you know.
Paul

[Mike K]

The Morris Commercial 1940 book ' repair aids for service vehicles' says:

The FWD C8 should have carby: S.92/164 fitted AKA Solex 40 RFVDL ( strangler vertical dustproof with Governor)

choke 29
main jet 150-57
aux jet 065
jet assembly 12-300


mph in top gear 44
governor 2500 rpm

Get hold of a flat edge and check the flat surfaces of the carby for warpage , this can cause air leaks .

[Lynn Eades]

Paul, about all I know of a Morris Commercial is that they have 4 wheels. However I imagine a mechanical fuel pump and the delivery pressure from one of these is probably about 2 to 3 psi. if your electric pump is delivering any more it can push the needle off the seat and may be giving you a higher than normal float level. This will likely mess up the idle circuit. You might need to fit a fuel pressure regulator? I would put a gauge on it first.

[Mike K]

Originally Posted by Lynn Eades

Paul, about all I know of a Morris Commercial is that they have 4 wheels. However I imagine a mechanical fuel pump and the delivery pressure from one of these is probably about 2 to 3 psi. if your electric pump is delivering any more it can push the needle off the seat and may be giving you a higher than normal float level. This will likely mess up the idle circuit. You might need to fit a fuel pressure regulator? I would put a gauge on it first.

Just to add to what Lynn has written

Some of the older Solex carbies are extremely sensitive to fuel inlet pressure- this I think stems from the days when many cars had the petrol tank mounted in the cowl and the fuel gravity fed down. I found this out after I spent a long time fiddling about with a Series 1 Land Rover Solex carby . In the end the problem ( running rich ) was not in the carby , but in the SU electric fuel pump . The pump spec was 1 to 1.5 psi but it was actually around 3 psi and this oversight caused me much grief along with frustration.

[Richard Farrant]

Originally Posted by Mike Kelly

Just to add to what Lynn has written

Some of the older Solex carbies are extremely sensitive to fuel inlet pressure- this I think stems from the days when many cars had the petrol tank mounted in the cowl and the fuel gravity fed down. I found this out after I spent a long time fiddling about with a Series 1 Land Rover Solex carby . In the end the problem ( running rich ) was not in the carby , but in the SU electric fuel pump . The pump spec was 1 to 1.5 psi but it was actually around 3 psi and this oversight caused me much grief along with frustration.

Mike,
There were two types of SU pump, high pressure and low pressure. For example a Morris Minor had the pump on the bulkhead and was a low pressure, whereas the Mini had the pump at the back near the tank and was a high pressure as it had to push the fuel further. I guess the delivery pressure at the carb equalled out between the two types. If using a SU pump it pays to check what application it was designed for.

regards, Richard

[pauldavies]

Mike I am sorry my problem has taken over your thread, but the news is good as yourself, Lynn and Richard have given me the answer to my problem. My C8 has the regulation carbi Solex 35/40 FVS and pressure has been my problem, I reinstalled the manual fuel pump, isolated the 12v pumps which are lifters close to the fuel source so work on about 4 psi and fired up the engine. The fuel/air mix screw was effective and I adjusted the idle, job done. I removed the manual fuel pump after to give it a service prior to final installation, I will go for a run tomorrow just to be sure all is good. I have left the 12v fuel pumps and the in line filters installed as I may use them for priming later down the line and don't seem to worry the system, I have the same 12v pumps on my Austin Champ so the later Solex carbi must be ok with the extra pressure. Many thanks to you all for the sound advise. Look forward to more pictures of your restoration Mike as it progresses.
Paul

[Mike K]

Paul

Good news. But don't break the speed limit in your C8 during the test drive

Us MCC owners have to stick together, we are few and far between in this far flung outpost

The old leather pinion seal on the CS8 rear axle is worn out and the 2" yoke had a deep groove worn in it . I decided to machine the yoke down to 50mm . I can buy a new 50mm pinion seal with a 70mm OD, this is close enough in size to the 2 3/4" original OD of the old seal .

I also had a win on EPAY and scored 4 new tie rod ends and some new front spring bolts and bushes for a cheap price, these are DUFOR brand made in NSW .The CS8 surprisingly has rather small diameter sized front spring pins, same dimensions as the Morris J2 van actually . The tie rod ends also fit a "Hillman Wizard" whatever that is ! and other vehicles from mid 1930's to early 50's including a MG .