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Harry Ferguson Tractors Discussion Forum

Low compression in an FE 35 grey/gold

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Rick

10-27-2003 03:33:29

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I have recently completed a full rebuild ( liners, rings, pistons, head recon inc valves, guides etc)of a 23 C motor in my Coventry built FE 35 ( ser no 43490) tractor. I still have low ( 250 psi instead of at least 350 preferably 450 psi) compression on No 1. The motor turns over as if it were a petrol not a diesel but fires up instantly when hot. I have done all the injectors and the pump and religiously checked cam and pump timing. I have heard one theory that the liners may have too little protrusion above the block to seat properly against the head gasket. The piston protrusion (below) the block is 12 thou.The valve height is 55 thou ( seem OK). Any ideas on where the compression went. This has been expensive. Id like my compression back! Rick

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David

10-27-2003 07:09:21

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Re: Low compression in an FE 35 grey/gold in reply to Rick, 10-27-2003 03:33:29

I'd suggest injecting a little oil into cylinder and doing a "wet" compression test. If compression is comparable on all four cylinders with a wet test, then leakage is probably to do with the rings on No1. Could rings in No1 have been damaged during assembly?

If No1 is still down on a wet test then it is probably a top end problem. If its a head gasket leak you might find bubbles in the coolant while tractor is running if it is leaking to the water jacket, or it might leak cylinder-to-cylinder in which case you might expect odd compression readings on adjacent cylinders. Or it could leak direct to the outside in which case you might find a leak by painting soapy liquid round head gasket and looking for bubbles as you crank it. A crack in the head or block would probably also produce coolant bubbles.

If everything is ok mechanically, it does sound like a tight valve clearance, or sticking valve. Did you look at the valve seats after recon? Maybe one was badly done (or even missed!)

Any chance the compression tester just isn't sealing right in No1 for any reason?

I'm interested to know what it turns out to be as I have a 23c that I'll need to work on sometime and would prefer to avoid problems if I can.

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john(UK)

10-27-2003 13:13:11

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Re: Re: Low compression in an FE 35 grey/gold in reply to David, 10-27-2003 07:09:21

How many hours has it run since you did the engine work, maybe it just hasnt bedded in yet. We did a lot of these engines and they always went ok, well as ok as a 23c could be, but they did need a lot of bedding in. Odd that one cylinder shouild be down so much though.

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Veijo (FIN)

11-06-2003 09:15:31

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Re: Re: Re: Low compression in an FE 35 grey/gold in reply to john(UK), 10-27-2003 13:13:11

I'm intrested to know how much the compression was in each cylinder? Was others in same level?

You live in Austria? (au-end in your e-mail) How much money did you put in new parts?

I have 1959 FE35 with 23c engine as well. I have improved Fergies poor starting a lot with driveing full throttle. I guess some carbon deposit has been removed.

I have cleaned fuel system totally, new filters etc. It also has glow plug in each cylinder.

Now it starts in -5 C decrees without water heater. I expect with heater there is no problems in any temperatures..

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