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Brian_NC

07-18-2007 20:30:38

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I recently purchased a MF 35 with a Perkins diesel which has supposedly just been rebuilt. When it's hot I've got 15-20 lbs oil pressure at low idle, which jumps up to 45 or so at half throttle. It has all kinds of power, the hotter it gets the better it runs, only noise is a slight knock when idling around the barn when I am hooking and unhooking and it lugs a little. Is that oil pressure a little low for a new rebuild? Also, the tach is registering backwards, previous owner said it had the wrong cable, but it I thought it might be one for a gas motor? It is new and hooks up like the parts book shows it to. Any advice will be greatly appreciated.

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oldfarmer

07-21-2007 13:16:29

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Re: 35 question in reply to Brian_NC, 07-18-2007 20:30:38

If you have not had a diesel engine before, it is normal for them to rattle at idle or when cold, newer diesel engines rattle less. Do not lug a diesel or pull it when still cold, keeping it out of rattling range is a sound idea. But they still last thousands of hours normally.

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supergrumpy

07-20-2007 06:47:19

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Re: 35 question in reply to Brian_NC, 07-18-2007 20:30:38

I have 135 3 cyl gas, knocks when you let the clutch out from dead slow idle but goes away immediately as rpms go over 850 or so, also worse when cold, I usually idle engine at 1000 rpm to avoid the noise

my tach scale goes from right to left so maybe you have wrong tach in the dash

engine was rebuilt by somebody that did a good job, oil pressure is 65lbs and drops to about 45 after long hard use on a hot day, pressure will drop to about 35 at idle but needle jumps a lot

not sure if that helps you but I think the engine internals are the same gas to diesel on Perkins

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Brian_NC

07-18-2007 20:42:30

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Re: 35 question in reply to Brian_NC, 07-18-2007 20:30:38

I forgot to add in the first post that I checked the oil pressure out of the block with 2 guages, both were within a couple pounds of each other. The slight knock I mentioned is present when hot or cold also.

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DavidP, South Wales

07-19-2007 02:53:41

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Re: 35 question in reply to Brian_NC, 07-18-2007 20:42:30

Hello Brian,
There seems to be an element in your message 'supposedly rebuilt'. On the basis of what you say I would suggest that you might have new bearing shells fitted and a worn crank. If this is the case it is most likely to be the number 3 big-end or gudgeon pin bush or rear main as they are the furthest from the pump and will suffer first. Slacken the injector nuts one at a time. If the knock reduces this will indicate where the fault may be.
Cheers
DavidP, South Wales

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Brian_NC

07-19-2007 20:25:06

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Re: 35 question in reply to DavidP, South Wales, 07-19-2007 02:53:41

David, I appreciate the reply. I tried the injectors, can't tell any difference with the knock. The only time I ever hear it is when for example I am backing the trailer in the barn idling along in high range reverse and it lugs a little bit. It doesn't always do it though, but when it does it has a fairly consistent rhythm until the engine speeds up. Oddly enough, it is not as noticeable when the engine is hot as it is when it is cold. I know the engine has had at least some work done to it, looking up through the oil screen hole it is as clean as a brand new one, and I've never seen oil stay so clean in a diesel. As bad as I hate to, I guess I'll send it to the shop and see what they find.

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John Wood

07-20-2007 10:41:15

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Re: 35 question in reply to Brian_NC, 07-19-2007 20:25:06

Hi Brian,

I am not sure where it is, but I am pretty sure the oil relief valve is supposed to be adjustable in your engine - it is on my MF-65 gas engine.. The oil pressure will suffer if the relief valve spring is worn/slack. If you can locate it in your manual, you might be able to either shim the spring to increase pressure or replace valve and spring. I did this when I rebuilt the engine in my JD450 crawler loader. The oil pressure now stays above 40 psi even after working the engine hard for a while.

It might be worth checking it out before going to the repair shop.

Re knock, are you sure one of the injectors is not playing up? Dribbling or sticking needle valve in the injector can give a knock that sounds pretty bad and make the engine knock quite a bit, making it sound like serious problems.

HTH

John

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