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Harry Ferguson Tractors Discussion Forum
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FE-35 High Idle throttle

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MArk

11-09-2003 10:33:32




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Hi!

Own: FE-35, 1957, Gasoline
I have problems setting my Zenith (28G) Carburettor!

RPM's are suddently very high (1500rpm) without the throttle being activated.

I have dismantled and cleaned the carby and tried to adjust it after a manual, without success. Still high RPM's.

I notice that I need to have the High speed Jet loosened about 7-9 turns for the motor to "idle" properly at 1500rpm. The idle air screw is turned approx. 1 3/4 out.

I notice the throttle finger screw on the back is screwed all the way out (counter clockwise)and rests a fraction from the seat and can be pushed the last ˝mm resulting the engine in dropping to 1300Rpms.

The Throttlearm on the carby can be rocked a bit back and forth, I dont know if its sufficient to let in air through the bearing.

Any suggestions what to do next?

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john(UK)

11-09-2003 17:13:33




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 Re: FE-35 High Idle throttle in reply to MArk, 11-09-2003 10:33:32  
It could be drawing enough air through that worn shaft to cause your problem. The main jet should be open about 2.5 turns from closed and the air screw 1 to 1 1/4 open to get it to run anything like correctly, adjust it when hot. If the engine speed won't drop when the governor rod is pushed manually to closed and it IS going all the way and not prevented from closing by its linkage setting then the carb sounds as though it is causing the problem. BUT it could also be drawing air through a damaged gasket on the manifold to cylinder head or the breather pipe on the valve cover, (the fibre washers used to break up with age) or even the valve cover gasket could be leaking.Adjust the carb first then check everything else.

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MArk

11-11-2003 09:11:15




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 Re: Re: FE-35 High Idle throttle in reply to john(UK), 11-09-2003 17:13:33  
Thanks for your answer John!

I gave it at go with the settings you've mentioned, this evening. But without results. I checked to see if there was any false inlet of air but everything seemed ok (I also checked while the engine was on). Only place I could'nt check was the Govenor axel.

However I got som new symptoms that might help.

Tractor started fine,(at 1500 rpm) but when I pushed the govenor arm the last fraction in, the engine rpms went down (over 4 sec) and the motor stopped joined by loud pops and bangs from the exhaustpipe. If I pick the Rpms up again the engine only reluctant follows, again joined by a lot of fireworks.

It seems that adjustment from 0-1500Rpm in the last 1/2mm on the Govenor arm is a little harsh. I checked the plate on then throttle and it looks ok, and closes fully.

Im puzzled where the engine gets the fuel for maintaining the high revs.(!)

Any ideas are most welcome.

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MArk

11-17-2003 03:28:12




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 Re: Re: Re: FE-35 High Idle throttle in reply to MArk, 11-11-2003 09:11:15  
Ok im allmost in a state of panic!

The search for airleaks with a can of WD-40 payed no result. (other than my motor now is well oiled)

I had before checked along all the gaskets in question, and found no moisture or other signs of leaks.

Could the engine timing bee the course? I havent adjusted since I got the tractor this summer. I have replaced the coil, plugs recently, though.

Perhaps as an effect on the high revs, my waterpump now seem to be sqeaking! Is it possible to smear it?

If you have any ideas they are most welcome. Im a bit out in the dark here. ;)

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john(UK)

11-17-2003 11:16:48




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 Re: Re: Re: Re: FE-35 High Idle throttle in reply to MArk, 11-17-2003 03:28:12  
No engine timing wont cause that. it must be down to air leak and from what you say it must be the carb now with the symptoms you give. You will appreciate doing the diagnosis remoteley like we do its difficult sometimes to be accurate. Telling you what to do, if you are not fully conversant with the engine its easy to miss something. and I think you have missed something. Is there a lot of play in the throttle shaft in the carb, not in and out, but up and down? if there is thats where the wear is and where its drawing air.

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MArk

11-17-2003 12:55:51




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 Re: Re: Re: Re: Re: FE-35 High Idle throttle in reply to john(UK), 11-17-2003 11:16:48  
Ok fair enough. :)
I will try to eliminate the possible causes 1 by 1, starting with a carb kit. (can't hurt)

Thank you for your patience and guidance!

I'll return to this thread somewhat later, when I make a breakthrough.

thanks for now.



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john(UK)

11-17-2003 13:01:25




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 Re: Re: Re: Re: Re: Re: FE-35 High Idle throttle in reply to MArk, 11-17-2003 12:55:51  
Hi Mark, If there is up and down play in the throttle shaft, make sure its the shaft and not the body of the carb that is worn. If its the carb top section that is worn you need to replace it, no use putting a kit into it I am afraid....



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john(UK)

11-11-2003 11:08:14




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 Re: Re: Re: FE-35 High Idle throttle in reply to MArk, 11-11-2003 09:11:15  
From what you say it still looks like an air leak . The high revs are on a very weak mixture and would account for the popping and banging. Have you actually checked the manifold gasket (between the manifold and the cylinder head) that did give problems on occasions, you may find the manifold loose even. Did you check the gasket between the carb and the manifold? You may have to remove the valve cover to check that gasket too.It does sound as though it is drawing air in somewhere. The governor shaft wouldn't be causing any problems like you have.If as you say the butterfly plate in the carb is closing then it seems that it has got to be an air leak from what you say. About the governor, when you get this sorted out, if the governor is playing up, post here again and I will give you the info how to set it all up again.

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MArk

11-11-2003 13:33:21




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 Re: Re: Re: Re: FE-35 High Idle throttle in reply to john(UK), 11-11-2003 11:08:14  
Ok I will give the gaskets you mention a closer inspection, and return with the results.



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Bernie

11-11-2003 16:19:40




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 Re: Re: Re: Re: Re: FE-35 High Idle throttle in reply to MArk, 11-11-2003 13:33:21  
It does sound like an air leak! Adjust the carb jets as per above reply... Get tractor running and let it warm up. After about 10-15 minutes take a can of WD-40 and spray a fine mist around the carb where there is any possibility of air intake (other than the actual carb intake itself). Listen for increase in RPM. Repeat this procedure around any intake related parts ie: intake manifold, intake lines and connections between carb and manifold. my guess is that you'll find that RPM increases after spraying area around throttle shaft. A can of quick start will also work, just take care not to use to much.

Cheers!

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