Silver rat look 240z

johnymd

Club Member
I've been trying to get the engine running today so too busy for pictures.

Removed the flat tops also got with all the smog ****. Repaired some 240 carbs and fitted them. No fuel to carbs so pump need s changing. It wouldn't suck from a petrol can. Good spark and even compression across all cylinders. Around 160psi. Going to have to remove the ac pump and bracket just to get to the fuel pump. May connect up and electric pump for the time being.
 

Rob Gaskin

Treasurer
Staff member
Site Administrator
I've been trying to get the engine running today so too busy for pictures.

Removed the flat tops also got with all the smog ****. Repaired some 240 carbs and fitted them. No fuel to carbs so pump need s changing. It wouldn't suck from a petrol can. Good spark and even compression across all cylinders. Around 160psi. Going to have to remove the ac pump and bracket just to get to the fuel pump. May connect up and electric pump for the time being.

Easy Start !
 

johnymd

Club Member
Easy start is a good suggestion but I'm guessing the cost of running the car on it would be poor :). I'd sooner use petrol and get the engine running properly.
 

johnymd

Club Member
A long day today but made some progress. The trouble with a car that has sat for so long is that everything need s fixing before it will work.

Started with the fuel pump. As said, I had to remove the AC pump and bracket to get to it and what a poxy job that was. Finally swapped the fuel pump far a spare and it started sucking from the tank. Engine started on a few cylinders then I notice a load of fuel coming from the rear float chamber. Suspecting float stuck I took the lid off and found no float in there. Swapped out the whole chamber for a spare I had and fired it up again. Ticked over now but still run **** so started fixing air leaks in the balance pipe. I had to use the US one to get the linkage to work so there were several holes to block up. This improved the running but still not good. Played around with the carbs a an hour or so with no real improvement so moved on to other things. with it now running I thought I'd try and drive it out the workshop. Clutch pedal went straight to the floor with no resistance. Checked the master cylinder and no fluid. Topped it up and released the slave bleed nipple. Connected my pressure bleeder and put 15psi on the master cylinder and nothing out the bleed nipple. Disconnected the pipe out the master cylinder and still nothing. Oh ****!, time to disconnect the pedal and remove the cylinder. I hate this job. The piston in the cylinder was stuck solid. Filled the end with WD40 and went next door for a cup of tea. Came back and hit the piston with a big hammer which got it moving. Held my finger over the outlet and it seamed to produce good pressure so back on the car it went. Clutch now worked so moved the car out and back in the garage. Getting there. No I'd better get it to stop. Master cylinder empty, toped up and still not pumping so off with it. Again, stuck solid so bit of release fluid, short break, then hit with the hammer again. First piston came out after a big whack but the second took a few hit and lots of fluid but eventually both out. Bores looked good so cleaned it all up and back it went. Fronts bleed fine but the backs seem to just be drinking fluid. I'll look at those another day. Dark now so moved the car outside to go through the electrics. Lights started working after a fare bit of playing with the switch and all appear OK apart from high beam not switching over. Indicator and hazards worked fine. Wiper's good. Choke light OK along with the annoying seat belt buzzer. Cant be far from MOT time.
 

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johnymd

Club Member
Took a few pics today.
 

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johnymd

Club Member
and some more.
 

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johnymd

Club Member
Last of this lot.
 

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johnymd

Club Member
Spent another day playing zeds, although half off it was mocking up a Yamaha R1 V8 with my mate and trying to come up with ideas on how to route the exhaust. Not much success though. With fresh knowledge of SU's I was confident a check and rebuild of both carbs would fix the running issue but it didn't. Found a few interesting things that I was confident would be the problem. One of the jet was jammed solid in the carb so turning the adjuster at the bottom did nothing. When I did get it to more and then free up I found it would not go all the way to the bridge. Eventually I found it was 3mm too short!! so I replaced it with a spare. Checked the float levels and adjusted the jet heights on both carbs but just couldn't get it to start. Engine runs really nice on easy start but only just ticks over on petrol. So to sum up, as I'm open to any suggestion:

There's fuel at the jet as if I take the jet out and hold it below the float chamber, fuel come out. Pistons move freely and drop to the bottom as they should. When you wind the jet up it stops level with the bridge. Wound it down 2 turns. Spark and timing fine as it runs well on easy start. What am I missing?

Anyway, gave up and jetwashed the underside of the car and engine bay.
 

racer

Club Member
Oil and springs in the carbs ok John?
Also how old is the fuel in the tank, might have been in there tens years!
 

johnymd

Club Member
Used some 30 weight oil in the dash pots. Put some fuel in it and it did run ok yesterday but wouldn't Rev.
 

jonbills

Membership Secretary
Site Administrator
Did you change the fuel filter already? Do you have a fuel pressure meter you can put on it?
Maybe sticking needle valves in the carbs, maybe the float level too low.
 

johnymd

Club Member
I've put a fuel filter on it. Not checked the pressure. I've checked the float level by removing the top and piston off the carbs and looking down the jet assembly to see how high the fuel level is in the tube. Not sure if this is the correct way but it seamed the easy way to check it. I would think fuel pressure wouldn't be an issue as long as the fuel bowls are full it will run without a pump for a short while.

I will take the fuel bowls apart and check the valves.

Thanks.
 

Rob Gaskin

Treasurer
Staff member
Site Administrator
John, just keep an open mind i.e. you might be chasing a fuel issue when it's something else.

I did that once - my VW camper broke down and a few days beforehand I'd done a lot of work on the carbs (twin carb version). I dismantled the carbs at the side of the road and couldn't find the fault. Walked home with my wife and baby. Went back later with my neighbour when it was dark and found the fault - knackered distributor cap (tracking inside). Learnt a lesson from that (next time I had an ignition fault I looked at the carbs first :rofl:).

From your previous posts it seems that the car has been 'messed with' a bit so it could be something wild like the cam a tooth out. I know you said it ran ok on Easy Start but how 'ok'?

Anyway you are more than capable of sorting it.
 
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johnymd

Club Member
It run very nice on easy start Rob which is why I discounted ignition. I do like to step back for a while though which is why I've asked for any advice. I've always believed brainstorming to be a superb method of eventually arriving at a solution. I listen to everything people have to say as the solution or the pointer towards the solution can could come from anyone.
 
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