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Hi Gents,

I recently picked up an LA120 on the cheap and I'm slowly restoring it. I notice there was a lot of tacky dirt on one side of the engine so when I cleaned it all up and ran the engine for a short time oil started to drip from one of the sump bolts. But this only happens while the engine is off and cooling. I tried tightening the bolt and the two either side of it. It drips a bit slower now but it's still going. So before I remove the engine and split the case I was wondering if anyone had any good tips I could try to stop this oil leak?





I also have a 21HP Kohler Command which I'm rebuilding and I just bought a second hand block (non working engine) for that. The owner had already split the case but then left it all in the rain. There's some mild surface rust in one cylinders but I am more concern with how I can clean off all the lime-scale/calcium that's covering all if the outer case and cooling fins.....any ideas anyone? .... is this something I need to blast of?



Many thanks.
Neo

Dripping oil---- probably a bad pan gasket. What I would do is pull the engine and replace the gasket. The major cost will be your time, which in the long run will be worth it.

Block cleaning---- the scale you see is not lime/calcium, but aluminum oxidation, normal for an older aluminum block. Trying to remove it would be a waste of time and money. I would give it a good pressure washing (steam or hot bath if you can) with a good soap/degreaser. Dry as soon as you can with compressed air and wipe the cylinder with engine oil to stop corrosion until you are ready to reassemble.

The Kohler looks as if someone used it for a boat anchor. :laughing: You can test a small area for calcium / lime water residue with any of many acid cleaning products. Neutralize with common baking soda and rinse well. I'd probably fire up my sand blaster for that one.

I think your right about the sea anchor SandburRanch :ashamed: ... And now I remember that the guy I bought this engine from lived near the coast line.

And Rivets its good to know exactly what it is now.... I think I'll try a high pressure wash first ... nothing to loose and everything to gain :smile:

All the best.
Neo7

I've ended up brushing off the engine with hand brushes and pipe cleaner brushes and then gave it all a coat of WD40.

Here's the end result.... I think it's looking better?.... well good enough either way lol!

All the best.
Neo

SandburRanch said:

The Kohler looks as if someone used it for a boat anchor. :laughing: You can test a small area for calcium / lime water residue with any of many acid cleaning products. Neutralize with common baking soda and rinse well. I'd probably fire up my sand blaster for that one.

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I could not tell one motor from another unless the name was stamped on it in big letters, but I have a LA-120 and I thought they all had Briggs and Stratton engines?

Jhon said:

I could not tell one motor from another unless the name was stamped on it in big letters, but I have a LA-120 and I thought they all had Briggs and Stratton engines?

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Sorry I've confused everyone .... my fault

The dripping is on my B&S Intek in my LA120.
The Ali corrosion is on my a Kolher Command engine that I'm in the process of rebuilding.... Don't ask me what for because all my mowers currently have good engines :laughing:

All the best.
Neo

Neo7 said:

Sorry I've confused everyone .... my fault

The dripping is on my B&S Intek in my LA120.
The Ali corrosion is on my a Kolher Command engine that I'm in the process of rebuilding.... Don't ask me what for because all my mowers currently have good engines :laughing:

All the best.
Neo

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No one here was confused except me... And that's because I did not read the captions between the pictures until now. Sorry about that.

No Worries Jhon :thumbsup:

My parents have an LA120, it also had the very same oil leak. The gasket has slipped out between the two case halves. You will need a new pan gasket and crankshaft seal. The pan gasket is very simple, but the shaft seal can be a real bear and you may end up having to replace it two or three times to get it to seal. My local tech told me I was very lucky that I got it right the first time.

mullins87 said:

My parents have an LA120, it also had the very same oil leak. The gasket has slipped out between the two case halves. You will need a new pan gasket and crankshaft seal. The pan gasket is very simple, but the shaft seal can be a real bear and you may end up having to replace it two or three times to get it to seal. My local tech told me I was very lucky that I got it right the first time.

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How many hours on it when the seal leaked?

I can't tell you at this moment, I don't remember how many hours it had on it when they bought it. But here is the story: They bought it from a family member claiming it was in great shape..big mistake. It was leaking when they got it, but the family member never bothered to clean it up, so he didn't notice what I would call a large leak. Of course, I gave it a good bath when they got it. I saw all the oil and dirt on the frame and side of the engine, but it was near the oil filter, so I thought he wasn't careful when changing the filter. Not 15 minutes running time after the bath, I noticed oil everywhere under the filter. I tried tightening the bolts, just like you did, and that didn't work. After deciding a repair was in order and getting the gasket and crank seal, I pulled the engine. When I pulled the sump/oil pan off, it appeared the gasket was never completely in place when the engine was assembled. It appeared as if a section of the gasket between the two bolts under the filter either simply slipped out before the bolts were tightened, or it may have been defective. There wasn't any gasket residue to remove in that spot before I put the new one on.

As far as hours, without being able to look at the hour meter now, I'd guess at 250 to 400 hours.