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The first time I pulled them both like you did was a few years ago. I had an 803A that was leaking oil really bad from between the engine and the gen head. My suspicions were correct. The rear crankshaft shaft seal was leaking. Like you mentioned, it’s so much easier to split them apart when...

That’s exactly how I did the one last year. I’m also fortunate to have an overhead hoist on a sliding I-beam. It makes those jobs very nice to do. Good work 🤙

Thank you sir! PM sent. Here’s a photo of the broken spool valve on this pump. Even if the one you want to sell me is all rusted up I’m pretty confident that I can use the spool valve from yours and make this one I have work just fine!

I might add here that I'm still unsure what wiped out these pistons. Afterall, that's what this tread was about. My gut is still leading me to believe that severe carbon build-up from wet-stacking was the culprit here. I know that this is hard to believe, but I really have no other explanation...

Well, instead of waiting to locate a different fuel pump for this unit I robbed Peter to Pay Paul. I “borrowed “ one out of my personal stand-by 10kw unit. Once the fuel system was primed it lit off. I let it run for about 10 minutes with no load. Then I began with a 25% load for about 30...

I should have said it's only when bolting down the rocker arms that the pistons need to be down inside of the cylinders. The cylinder head can be installed with no issues.

Just a little set-back on this project. I had everything back together on the engine yesterday. I'm a believer in reading the TM's for sure! They explain very well about the hydraulic lifters for the valves and how to properly bolt down the cylinder head with the pistons down inside of the bore...

Oh…forgot to mention. You’re correct. The piston crowns are .016” smaller than the skirts.

Thank you Ray. My ring gaps are more like .012” - .015”. It looks like .010” is the minimum and .020” is the maximum. My .002”-.003” measurements are the piston to cylinder wall clearances. Appreciate the input!

I know! The shipping time is amazing from the UK. This is the first one of these machines that I’ve had the head off of. I wonder how many are out there with .040” OS pistons? I wish you well on that project!

That’s great to hear! It appears that I’ll be adding a Lisle hone and an assortment of stones to my tool arsenal because they’re already on order. I really appreciate the help here on this topic! Some more cleaning and going back together today:jumpin:

Well, not being a machinist and dealing with an engine that suffered piston and ring failure I’m a little “wishy-washy” regarding what the piston to cylinder wall clearance should be on this Lister Petter 4 cylinder Diesel engine. After watching hours of YouTube videos on this topic and reading...

I did go ahead and order the Lisle 15000 cylinder hone that Ray wrote about in post 29. I also ordered some 80 grit, 240 grit and 500 grit stones for it. Everything that I can find about piston to cylinder clearances is telling me that .002" - .003" clearance is not enough. Unless someone pipes...

Thank you. I did see that post also. No issues with the GP’s and/or S1 or K18.

I have a question for the engine guru’s. I’m not satisfied with the piston to cylinder clearances that I’m seeing with these new pistons. I have some good quality outside micrometers and telescopic bore gauges that I’m using. My piston skirts are measuring 3.392” -3.395”. My bores are measuring...

I received my new pistons today. Hard to believe that they made it here in 3 days from the UK. I’m now a fan of Sleeman & Hawken for sure! I’m going to spend some time this weekend and mic my bores and pistons. In years past I have “ rebuilt” several different engines. Most of the time I’ve...

I hope that you get the same service that I received!

Email with sean@sleeman-hawken.com. Extremely helpful...like I'm buying a large number of parts or that I'm a major distributor of their products. I don't think it's too late in the day to get a response from him. So you're needing the 750-41610/100 pistons correct?

The tracking number says that it was shipped from Castle Donington, United Kingdom on March 23rd. It's showing in Philadelphia, PA now.

I wanted to post an update on the piston situation for this MEP-803A that I'm working on. Good news today! Sleeman & Hawken in the UK have already shipped my .25 mm OS pistons. The price (including shipping) ended up at $178 ea. And...check this out! The ETA on the UPS tracking number they...