S1 Sad and Stuck (both S1 and me!)

[JamesM]

Oh well - I've neglected my S1 for a couple of years what with Covid lockdowns and getting sidetracked onto restoring a Blitz F15, so now it's teaching me a lesson and I'm not sure how to fix it..

1. It won't start and petrol drips from the base of the carbie when the pump is on. (Engine turns over and pump is working). The leaking didn't responded to rapping with the handle of screw driver, so do I need to pull it apart to clean it, or is there an easier solution? I wondered about cranking it with a jump start to see if that would unstick the needle or whatever, but with petrol dripping onto the manifold it seems a tad risky.

2. It won't move, even though both levers are in neutral and the 4wd button is up. On jacking up the wheels one-at-a-time I discovered that the front wheels freely rotate to the front (moving the drive shaft) but not to the rear; and that the rear wheels freely rotate to the rear (moving the driveshaft) but not to the front. It feels is if it's in some sort of gear and since the rear drive shaft rotates it isn't the hand brake. I'll try rocking a wheel while the missus moves the gear levers but I'm not hopeful. I guess if I can start it I could try driving it to see if that fixes it but this might cause more problems? Any advice greatly appreciated!
Cheers
James

[B.S.F.]

With the red lever in neutral the front and rear shaft are locked together. The reason being so that the hand brake works on front and rear wheels when using the winch or other PTO equipment.
.W.

[JDNSW]

The petrol dripping from the carbie says it is probably flooding - which will usually prevent starting. Flooding is almost certainly a worn or stuck needle valve, or a leaky float.

But of course, this may not be the (only) reason for not starting.

[JamesM]

Thanks for the replies. Carby needle was stuck and easily fixed, so started and ran. One of the (younger/stronger) kids rocked Oggin a couple of times and it rolled ok, so it went for a run around the paddocks without drama. EXCEPT..

1. Coolant leaking out overflow pipe even when cold/warm. The radiator cap has bumps around the edge and there are also bumps inside the radiator housing, and I'm sure the bottom sealer of the cap is getting caught on these bumps and not seating correctly. Hadn't noticed this previously but I'm wondering if this is the correct setup or if I need a new cap (in which case where to get one?). Otherwise I might need to try flattening the bumps? Pics attached

2. The vacuum advance tube (rubber) isn't attached to the carbie (Solex) and the port on the carbie has been blocked off. From threads on here it seems folk don't think it makes much/any difference in S1?
Thanks again.

172411172412

[JDNSW]

The radiator cap looks correct. Note however that if filled to the top it will overflow as the coolant heats up for the first time - it expands.

I can't comment on the vacuum advance, not having tried to run a S1 with the vacuum advance not running. However, I would note that if the timing is set for best results at idle or by the book while static, this should result in the spark timing being incorrect, excessively advanced at speed and pulling in the first case and excessively retarded at idle and especially at speed with the throttle closed in the second case.

The effects are probably not noticeable if the vehicle has not been driven when operating correctly, especially if the idling speed is increased from the book's 5-600 to 1000-1200 in line with modern practice (although this is likely to wreak havoc with gear changes into first and second!).

Bear in mind that the vacuum line may have been disconnected either because it is leaking (damaged diaphragm?) and causing carbie issues, or because the mechanism is seized.

[1950landy]

As John said the water in the radiator should just cover the radiator core & any excess water will only be released once the water expands.
As for buying a new cap if you can't find one try the Ferguson Tractor dealers in AU they use the same caps & have them listed on Ebay quite often, I have found a few items on the tractors the same as S1's for instant the 80" amp meters are very close to the Fergy ones .

[JamesM]

Thanks for the advice. Much appreciated.
I'll see if I can fiddle with the cap to see if it will sit down on its seat, or get another.
The vacuum advance might be a can of worms if it was disconnected because it was broken - will need to give that more thought!
James

[1950landy]

PM sent.

[russellrovers]

Thanks for the advice. Much appreciated.
I'll see if I can fiddle with the cap to see if it will sit down on its seat, or get another.
The vacuum advance might be a can of worms if it was disconnected because it was broken - will need to give that more thought!
Jamesjust sent a load of caps to the scrappy nobody asks for them even when there free jim

[JamesM]

Pulled the vacuum advance off and removed the spring, then sucked and the plunger seems to move normally, so it seems to be OK. It had a length off rubber tube (connected to dissy end only) but this was originally 1/8" OD copper tube, so I wonder where I can get this? I have the end fittings so should be able to fit those, but I'm not having much luck finding the tube - although repco does list it as a "special order". Any pointers?

I'd also be grateful for an idea of where the tube is routed - I think it goes around behind the engine but not sure where it would be clamped to?
Thanks again for all the great help
Cheers James

[russellrovers]

yes i have the parts can order jim

[1950landy]

Pulled the vacuum advance off and removed the spring, then sucked and the plunger seems to move normally, so it seems to be OK. It had a length off rubber tube (connected to dissy end only) but this was originally 1/8" OD copper tube, so I wonder where I can get this? I have the end fittings so should be able to fit those, but I'm not having much luck finding the tube - although repco does list it as a "special order". Any pointers?

I'd also be grateful for an idea of where the tube is routed - I think it goes around behind the engine but not sure where it would be clamped to?
Thanks again for all the great help
Cheers James

I bought some from Repco couple of years ago , ordered it in the morning & had it by early afternoon & could order a small quantity .

[JDNSW]

Pulled the vacuum advance off and removed the spring, then sucked and the plunger seems to move normally, so it seems to be OK. It had a length off rubber tube (connected to dissy end only) but this was originally 1/8" OD copper tube, so I wonder where I can get this? I have the end fittings so should be able to fit those, but I'm not having much luck finding the tube - although repco does list it as a "special order". Any pointers?

I'd also be grateful for an idea of where the tube is routed - I think it goes around behind the engine but not sure where it would be clamped to?
Thanks again for all the great help
Cheers James

As you suggest, it runs round the back of the head. Mine is not clamped anywhere but I seem to remember it should be clamped with a light metal bracket under one of the manifold bolts.