Liner choke

Skip Burney · Apr 29, 2017

Well I am almost finished with my NEW block getting it ready to put together. I need to clean up the exhaust and intake ports a little more and lap the valves on THIS block and I will be good to go. I took out the oil gallery plugs before I vatted it and then cleaned everything out with carb cleaner and pulled a swab through it and reinstalled the plugs but I have a question for yall. I pushed out the old liners and my block looked really good I cleaned up the bores and measured everything and had between .003 and .005 interference. I pushed the new liners in and they went really well but when I measured the bores they were choked. The bore was spot on in the middle of the liner for new rings but the top and bottom of the new liner bores were about .005 below min. This could have either bound up the new rings in the ring grooves or scuffed the top and skirt of the piston. A few minutes with the hone and the bores are now straight top to bottom at min for new rings. Have any of you ever run into this? Also what do you put on the threads of the head bolts that penetrate into the water passages to seal them up.

Den N Ms · Apr 29, 2017

Skip,Yes the sleeves can somewhat squeeze in from the interference fit.You did right by honing then to fit the pistons for proper clearance.I use liquid Teflon on the head bolts with good results.Looks good and you are doing it the right way,clean oil galleys ,ect.Did you also remove the welsh plugs before block clean a lot of crud can be between the cylinder castings .

Skip Burney · Apr 29, 2017

That's good stuff I have about 2 or 3 cans around the shop, I didn't know if yall used something special or not. Yep I took everything out of the block before I vatted it. I removed the plugs in the oil gallery and took some .030 safety wire and twisted it with a drill on one end and the other ends in a vise. I leave a big enough loop in the end to slip a swab soaked in carb cleaner through then I push the safety wire through the gallery and wrap the other end around a screwdriver and pull it through then blow it out with compressed air. I stop when I get a clean swab out. I will chase all of the threads tonight and be ready to put it all back together this week. I ll keep ya posted.

Den N Ms · Apr 29, 2017

Skip,You are doin it right ,GOOD WORK!

Ken(Ark) · Apr 29, 2017

I pushed the new liners in and they went really well but when I measured the bores they were choked. The bore was spot on in the middle of the liner for new rings but the top and bottom of the new liner bores were about .005 below min. This could have either bound up the new rings in the ring grooves or scuffed the top and skirt of the piston. A few minutes with the hone and the bores are now straight top to bottom at min for new rings. Have any of you ever run into this?

I could see this as another reason some shops would have installed their own automotive type sleeves . It is hard to pay the bills when most people want to save money and you have to spend twice the time to keep your reputation good . Of course we don't mind spending more on parts than the tractor is worth , it is a hobby . 30 - 40 years ago an N may have made your income .

Liner choke

Skip Burney

Member

Den N Ms

Well-known Member

Skip Burney

Member

Den N Ms

Well-known Member

Ken(Ark)

Well-known Member

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