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to30 compressiong results

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bad_bo_ti

01-22-2008 17:33:34

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I just did a compression test on my 30 and found all 4 cylinder are right around 50lbs. havent put oil in them yet to see if they come up or not. A couple years ago I did go through the head and adjust the valves, if that is my problem should i just have the hole head redone? how much money would be involved in that? thanks, chris

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Jim in OH

01-27-2008 19:03:48

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Re: to30 compressiong results in reply to John Mason, Michigan, 01-22-2008 17:33:34

bad_bo_ti said: (quoted from post at 15:53:40 01/27/08) Ok I just redid the compression test, I will admit I did it wrong the first time, are the new results. cylinder 4) 90lbs 100lbs with oil, 3) 80 100with oil, 2) 90 95 with oil, 1) 85 90 with oil. now what does this tell me? Also most of my plugs were black (fouled). I was thinking of gettting electric ign and new hi volt coil and maybe having the head redon and seeing what the cylinders looked like and maybe put new rings in it. what do you think? thanks, chris

As I suspected, everything looks pretty good in the compression.... maybe just a tad low at 2, but not bad.. black fouled plugs indicate too much fuel.. I'd suggest adjusting the carburetor... and if that doesn't solve the problem, other fuel issues need to be looked into... perhaps rebuild the carb.... Good luck.. Jim in OH

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bad_bo_ti

01-27-2008 14:53:40

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Re: to30 compressiong results in reply to bad_bo_ti, 01-22-2008 17:33:34

Ok I just redid the compression test, I will admit I did it wrong the first time, are the new results. cylinder 4) 90lbs 100lbs with oil, 3) 80 100with oil, 2) 90 95 with oil, 1) 85 90 with oil. now what does this tell me? Also most of my plugs were black (fouled). I was thinking of gettting electric ign and new hi volt coil and maybe having the head redon and seeing what the cylinders looked like and maybe put new rings in it. what do you think? thanks, chris

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Jerry/MT

01-23-2008 11:47:09

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Re: to30 compressiong results in reply to bad_bo_ti, 01-22-2008 17:33:34

If you ran the test correctly, with the engine at operating temperature, the throttle plate wide open and no air cleaner resriction and got those results I"d say your rings are worn.

You said the compression was "right around 50 pounds". What does that mean? If there was a large variation in pressure, cylinder to cylinder, then it could be a valve problem and if adjacent cylinders are low it could be a bad head gasket.

The more data you provide, the better advice you get on this forum. If you can you give us the individual cylinder pressures and tell us how you ran the test, you can probably get a better answer. If you reconduct the test and you have significant variation (> 5psi) between cylinders, I"d suggest you add an ounce of oil to each cylinder and repeat and record those results also. Then post these results and we"ll get back to you.

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johnand cindy

01-23-2008 08:44:41

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Re: to30 compressiong results in reply to bad_bo_ti, 01-22-2008 17:33:34

I did my valves. I needed all new I had it done at a local machine shop he replaced everything as it was all messed up for $360.00 I thaught I got a good deal concidering the damage to the head. Now it runs great with all kinds of power. This tractor will almost do anything I require of it for its size and more. I have recently joined PAATA people against antique tractor abuse. LOL

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Jim in OH

01-23-2008 08:10:30

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Re: to30 compressiong results in reply to buford, 01-22-2008 17:33:34

LarrySTN said: (quoted from post at 05:33:19 01/23/08) Valves do not leak uniformly. if you have uniform compression and it is really low ie 50psi, you have bad rings or you did the compression test with the throttle plate closed on the carburetor. Either way the head and valves are not the cause.

I agree... Causes of uniformly low compression (when there is really nothing wrong) are: (1) cranking too slowly... i.e., weak battery, bad connections, high resistance in battery etc. (2) dry cylinders... maybe setting for a long time, or fuel washed by flooding.. (3) and of course what Larry mentioned.. throttle closed..

My initial reaction is that there may be nothing wrong with your compression... Jim

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LarrySTN

01-23-2008 04:33:19

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Re: to30 compressiong results in reply to bad_bo_ti, 01-22-2008 17:33:34

Valves do not leak uniformly. if you have uniform compression and it is really low ie 50psi, you have bad rings or you did the compression test with the throttle plate closed on the carburetor. Either way the head and valves are not the cause.

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gshadel

01-22-2008 18:41:42

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Re: to30 compressiong results in reply to bad_bo_ti, 01-22-2008 17:33:34

Bad... 50 psi across all 4 cylinders is pretty weak. Do a squirt of oil in each cylinder and recheck compression. If it does not improve, then yes, your valves are the likely suspects. Good compression should be upwards of 100 - 120 psi. Down in that 50 range my guess is your TO is maybe hard starting, and low on power.
Just adjusting the valve lash won't really help if your valves are gunked-up with deposits or not sealing due to wear. A valve job is not really a hard job. You may be suprised at how much of it you can do yourself and save some $$$. Get yourself a Ferguson re-print service manual and read-up on it. I rebuilt my engine several years back. I striped the head down myself, took the head, plus my new valve guides to a machine shop, they re-ground the valve seats, pressed in the new guides, checked the head for warp & cracks, super cleaned it and painted it for $90. I installed new valves myself and put the head back together. Overall, that was the cheapest portion of the whole rebuild.

George

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CENTAUR

01-22-2008 17:54:02

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Re: to30 compressiong results in reply to bad_bo_ti, 01-22-2008 17:33:34

TEST. CENTAUR

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CENTAUR

01-22-2008 17:58:31

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Re: to30 compressiong results in reply to CENTAUR, 01-22-2008 17:54:02

Sorry i was just testing my new deal.Not for you.CENTAUR

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