perkins 4.236

catskinner22 · Sep 26, 2014

ok all you smart and wonderful people bought a wood chipper with a4.236 looks like it has been rebuilt recently. The oil pressure when cold is running around 60 to 65 lbs. I checked it all out and sent it out with the crew. when they came in I asked how it ran they advised great. They all left I gave it the once over oil ok water ok. I started it and no oil pressure took oil line off dribble no pressure. before it left that 1st morn I ran it at about 20 min at 1/2 throttle still had 55-60 lbs pressure. The next morn started it 60 lbs. I tore it down today and it has been rebuilt recently. The only thing I have found to this point is where the balancer bolts to the block there are supposed to be 2 sleeves that go between the block and balancer There was only one. Do you think this could be the problem. I know this is a tractor forum but I know tractor guys have been there done that

ptfarmer · Sep 26, 2014

A MF175 tractor has the same engine, I don't think the missing dowel would effect oil pressure, but it helps keep everything lined up so I would get one, and put it in.

Now for the low oil pressure.
1. The strainer on the oil pickup gets blocked.
2. The oil filter is getting choked up, or collapsing.
3. A bad pressure relief spring (as it gets hot it looses tension).
4. Pressure relief valve sticking open.
5. The oil pump is worn out (excessive clearance).
6. The bearings in the engine are worn out.

Start from 1, and go down the list. On most of the engines I see that get low oil pressure as they get hot is "usually" worn bearings.

Ray UK · Sep 27, 2014

One more to add to the check list,
When checking the oil strainer also check the oil pick up pipe
for cracks especially around welded on support brackets.

Good luck.

catskinner22 · Sep 27, 2014

(quoted from post at 03:35:50 09/27/14) One more to add to the check list,
When checking the oil strainer also check the oil pick up pipe
for cracks especially around welded on support brackets.

Good luck.

will start looking shortly Thanks

DavidP, South Wales · Sep 27, 2014

Hi,
The 4.236 does not have a steel pipe as part of the oil pick-up. This engine has an aluminium elbow attached to the strainer and the rear of the pump assembly. It is essential that the dowel sleeve is replaced as the balancer unit creates forces to help cancel those created by the rapid acceleration and deceleration of the pistons. The balancer must be totally secure. Make sure that the sleeve has not remained in place in the block face. Check that there is no damage to the strainer and that the gap between the strainer face and the sump floor is adequate for oil to flow in. Check that the drive to the oil pump from the crank gear on and condition of the pump are satisfactory. Check the relief valve etc and other steps as suggested by ptfarmer above.

DavidP, South Wales

Ray UK · Sep 27, 2014

Thank's for correcting me David, It is 40 odd years since I was working on these regulary so my memory is probably not what it was. I do remember changing a few pick up pipes on the AD3-152 engines though.
I agree with you about the balancer locators, I seem to recall them having a spell where the needle rollers on the balacer shafts would disintegrate causing all sorts of horrible noises.
Ray.

catskinner22 · Sep 27, 2014

(quoted from post at 15:04:38 09/27/14) Thank's for correcting me David, It is 40 odd years since I was working on these regulary so my memory is probably not what it was. I do remember changing a few pick up pipes on the AD3-152 engines though.
I agree with you about the balancer locators, I seem to recall them having a spell where the needle rollers on the balacer shafts would disintegrate causing all sorts of horrible noises.
Ray.

Hey that will be enough of that kind of talk. Checked the main and rods with plastic gauge they were ok the oil had a burnt smell when pulled oil pump apart but it was ok. Begining to think engine was running hot found temp gauge wire melted by manifold. Ill keep checking

ptfarmer · Sep 27, 2014

I'd look at the oil pump, you could re-build, or re-place it (it probably wouldn't hurt) it's something like $50 for a oil pump. How did the oil filter look?

catskinner22 · Sep 27, 2014

(quoted from post at 17:24:16 09/27/14) I'd look at the oil pump, you could re-build, or re-place it (it probably wouldn't hurt) it's something like $50 for a oil pump. How did the oil filter look?

the oil flter was pretty old and heavy nothing out of the ordinary when I poured it out.

ptfarmer · Sep 27, 2014

Is it a spin-on, or the canister type? If it's a spin-on you can cut the outer shell off, and have a look at the filter itself.

catskinner22 · Sep 27, 2014

it is a spin on I will cut it in the morning I did not see any thing in the oil just a light burnt smell

ptfarmer · Sep 27, 2014

Once you cut it open that's where you will find any bad stuff if there is any.

DavidP, South Wales · Sep 28, 2014

Hi Ray, yes you are correct. The 3A.152 and AD3.152 did have a lot of problems with the pick-up pipe cracking or breaking until the brazed on bracket was replaced with the rubber grommet and clamp design.

DavidP

catskinner22 · Sep 28, 2014

(quoted from post at 06:18:50 09/28/14) Hi Ray, yes you are correct. The 3A.152 and AD3.152 did have a lot of problems with the pick-up pipe cracking or breaking until the brazed on bracket was replaced with the rubber grommet and clamp design.

DavidP

well cut the filter in half today it was clean. At this point I think it was running hot since the temp gauge was not working. It is low on coolant and cant tell u how low yet going to install new temp gauge before filling it up and trying it agian. everything inside lookes good no cracks

ptfarmer · Sep 28, 2014

What oil are you running in it? I've had good luck with Shell Rotella 15w40, it does good even in the hot Texas summers. Also I'd avoid Fram oil filters, get a Wix, or Napa (made by Wix) oil filters.

catskinner22 · Sep 28, 2014

(quoted from post at 16:14:45 09/28/14) What oil are you running in it? I've had good luck with Shell Rotella 15w40, it does good even in the hot Texas summers. Also I'd avoid Fram oil filters, get a Wix, or Napa (made by Wix) oil filters.

I dont know what was in it smelled like rotella no idea on weight. it just seems strange that it ran for 20 min at half throtle and pressure stayed up. I understand that it was under no load. Being 59 years old and have seen my share of :shock:. I wish I could have watched it at the job site. Well cant get a filter untill tuesday they have to order it

perkins 4.236

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