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Tea 20 oil pressure

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Barry

09-02-2007 09:35:54

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engine oil pressure is good until the tractor run for about 5 min,then pressure drops to about 5 pounds

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John (UK)

09-05-2007 11:05:05

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Re: Tea 20 oil pressure in reply to Barry canada, 09-02-2007 09:35:54

Very often the problem with the oil pressure on these engines is the oil pump is worn due to not changing the oil, so fitting a Rotor Pack to the oil pump will make a difference. If you drop the oil pan you can check the bearings at the same time and fit new shells if they are needed. they will be showing the copper backing through the white metal if they are worn, for what they cost it is well worth doing because once they start on the copper they can wear the Crank quickly. The other place that the oil pressure is lost is through worn Camshaft bearings, but to do these is a major overhaul job as everything has to come out and the Block has to be bored and cam bearings made and fitted and then line bored. Consider fitting the Rotor pack though, you can get these from Sparex as part S69996 and they have all the gaskets etc. if you need the numbers just email me....John

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toolman

09-03-2007 13:41:07

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Re: Tea 20 oil pressure in reply to Barry canada, 09-02-2007 09:35:54

Hey Barry, my tea 20 would backfire just like you say yours does.Mine is a Lucas 12 volt,i tried everything, one day i was reading somewhere and it said 12 volt "positive ground" well i turned the battery around and guess what all misses went away,i asked John UK and he said yup POSITIVE GROUND, and you have to change them little wires on the coil around too.Mine runs fine now no misses at all and it sure was a simple fix.It had run negative ground for years.

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Barry canada

09-04-2007 06:41:03

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Re: Tea 20 oil pressure in reply to toolman, 09-03-2007 13:41:07

hi toolmani am running a 12 volt conversion with an altinator can i reverse the polarity without hurting the altinator

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John (UK)

09-05-2007 10:57:18

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Re: Tea 20 oil pressure in reply to Barry canada, 09-04-2007 06:41:03

Hi Barry, Keep your alternator on NEGATIVE ground but check the feed wire to the HT coil is on the correct terminal, the feed terminal is marked in various ways depending on who made the coil, it can be + or PWR or IN...so the wire that feeds the power from the switch to the HT coil goes to that terminal. If you have changed to 12v then you need to change the points gap as well to .015". If you need the timing instructions or anything else, just email me....John

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toolman

09-04-2007 09:57:03

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Re: Tea 20 oil pressure in reply to Barry canada, 09-04-2007 06:41:03

No i on,t think so , best ask John Uk, if your running a alternator i think it is negative ground.

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ron8n9n

09-03-2007 06:23:41

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Re: Tea 20 oil pressure in reply to Barry canada, 09-02-2007 09:35:54

according to my book, 7 Lbs is enuf.; The ferg oil pump is notoriously weak.

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John (UK)

09-06-2007 06:44:10

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Re: Tea 20 oil pressure in reply to ron8n9n, 09-03-2007 06:23:41

You are getting your engines mixed up Ron, you are thinking of a Continental engine, a TEA has a Standard Motors Engine and that should run between 40 and 60 psi.

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John Ludington

09-02-2007 13:21:00

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Re: Tea 20 oil pressure in reply to Barry canada, 09-02-2007 09:35:54

My TEA20 does the same thing. I guess it needs new bearings,however I don't use it much . The next time I change the oil I'll use a thicker grade ie. 20W50 to see if that helps.

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John (UK)

09-06-2007 06:49:57

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Re: Tea 20 oil pressure in reply to John Ludington, 09-02-2007 13:21:00

Using a thicker oil will help but try adjusting the relief valve on the top of the oil filter a couple of turns, slacken the lock nut and then screw the threaded part in two turns, it may help. It isn"t always the bearings that are worn, the oil pump wears too if the oil isn"t changed as it should be, fit a new rotor pack in the engine oil Pump it will certainly help the pressure.John

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Barry canada

09-02-2007 17:16:46

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Re: Tea 20 oil pressure in reply to John Ludington, 09-02-2007 13:21:00

i replaced the distributor as all the parts were badley worn (bushing spark advance bearing).the tractor idles very rough andat higer speed there is a slight back fire' when i put it under aload it seems to even out.

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Jerry/MT

09-02-2007 22:19:45

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Re: Tea 20 oil pressure in reply to Barry canada, 09-02-2007 17:16:46

Have you timed it with a timing light? Was the timing "jumping around"? If so, your timing chain/sprockets maybe worn.

Did you have the distributor "curved", i.e. had the advance springs adjusted to give the proper centrifugal advance as a function of rpm?

Do you have a FAT, BLUISH-WHITE SPARK? The roughness could be due to poor spark. Check the primary ignition circuit. Do you have the correct firing order?

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Barry canada

09-02-2007 14:17:37

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Re: Tea 20 oil pressure in reply to John Ludington, 09-02-2007 13:21:00

my tractor does not have any knockls or engine noise[how ever i do not seem to be able to get it timed just right] i replaced the distrbutor with a good used one and it helped quite a bit but it is still not right any help wold be appreciated

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ron8n9n

09-03-2007 06:25:02

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Re: Tea 20 oil pressure in reply to Barry canada, 09-02-2007 14:17:37

Most ferg dists need a rebuild,,,,, ,use a delco if you can

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Jerry/MT

09-02-2007 15:26:04

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Re: Tea 20 oil pressure in reply to Barry canada, 09-02-2007 14:17:37

John(UK) has a lot of experience with the TEA/Standard Engine and he might be able to discuss specific problems with it.

Usually low oil pressure is caused by a stuck open pressure relief valve, worn oil pump, and/or worn bearings. Specifically, what problem are you having with your timing and why did you replace your distributor?

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Bob (Aust)

09-02-2007 20:06:02

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Re: Tea 20 oil pressure in reply to Jerry/MT, 09-02-2007 15:26:04

My TEA20-85 has 20 psi oil pressure at idle, 50 psi at high revs when warm.

Rough running especially at higher RPM - have you checked the distributor governor weights are free, not sticking? Have you recently changed the timing chain? You may also have a fuel problem, although backfiring sounds like timing. Is the backfiring regular (i.e. one cylinder only) or intermittent? Plugs and points OK with correct gap?

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