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Messages - hugh54

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Engines / Big end torque settings

« on: January 15, 2023, 06:31:22 AM »

Hi again

I looked for the torque settings for the big end nuts but there doesn't seem to be any info about it. I guess it's a matter of getting it tight enough so that the split pin fits? Does anyone have any comments on the right way to do it?

Thanks

Engines / Re: CS 3-1 big end bearings

« on: January 15, 2023, 06:27:20 AM »

Thanks for the responses. I've decided to go with the original bearings as there is nothing wrong with them. With a plastigauge they have .002". I only pulled it down to check the bore to see why it was blowing smoke.

I figured reassembly was going to be easier by partially fitting the piston up into to the bore from the bottom so that the rings were just inside, while the block was on the bench. Then fit the rod to the piston and push the piston all the way up into the bore. Then turn it over lower the whole lot down onto the studs.

Trouble is doing it this way is that it makes it impossible to get to the bearing cap bolts from the top after the block is fitted. So with the new bearings spreading the cap fractionally, when the bearing cap is tapped up into place it pushes the bolts up, and not being able to get to the bolts from the top, it's impossible to tap them back down.

Learn something every day.

Engines / CS 3-1 big end bearings

« on: December 30, 2022, 11:20:48 PM »

Hi,

I'm fitting new big end shells measuring the clearance with plastigauge, and was wondering if anyone has noticed new big end bearing shells spreading the cap fractionally making it difficult to fit the cap, particularly from underneath inside the crankcase. It was easy to fit with the old shells but with the new ones the cap goes as far as the shank of the bolt where the thread stops and then has to be tapped on to go any further. It makes it difficult when testing for clearance with a plastigauge. I would have to tap the bolts out to get it off.

It seems that the spread of the bearing spreads the cap a fraction.

Might have to try a bit of wet and dry on the bolts to polish them a bit perhaps.

Cheers

Engines / Re: CS 3-1 blows blue smoke

« on: December 25, 2022, 11:05:59 PM »

Thanks for all the good info. I thought about a glazed bore and that might well be the problem. There are areas on the bottom ring that indicate that it is not bedded in. Good idea about the injector too. I wasn't going to pull that but will now. I have the cylinder off now so will de-glaze the bore and fit new rings.
Thanks again
Cheers

Engines / CS 3-1 blows blue smoke

« on: December 23, 2022, 10:07:22 PM »

Hi, Perhaps someone has some ideas from their experience with Listers.
I have a CS 3-1 that blows blue smoke and accumulates oil in the exhaust port which drips from the exhaust pipe. It's not being used to power anything and has no load when running.
The previous owner overhauled it with new mains, big end, rings and valves. In an effort to find out why it blows smoke I have pulled the head and barrel, and the rod to check the big end. The rings are good with the correct ring gap and ring to land clearance, bore is good and you can still see the cross hatching. Everything else looks like it's just been overhauled which, in actual hours running, in has I guess. So at a bit of a loss what to fix. I'm going to fit new rings and big end anyway.
I was wondering if anyone has any ideas. Perhaps it's blowby caused by not being run in?
Thanks in advance for any ideas.
I should have mentioned that the valve guides are good, no appreciable wear.
Cheers