Discussion in 'Members Projects' started by sdibbers, May 22, 2014.
@harveyp6 Good news I think. Took 20 mins to drain less than 1/8” of paraffin on all cylinders. In fact no. 3 was just a little behind the others.
Did you have any luck find a 2200 TC head? Maybe any potential UK shippers might consider shipping it to Ireland if they won't send it to the US - if so, I'll be there in August - I could just boot it out of the plane as we cross Jersey on the way back to the left coast...
No luck on the 2200TC head. But at least I’ll have her back on the road soon. Harvey’s advice has saved me doing the piston rings.
Quick update. Today’s apparently some sort of holiday here. So I celebrated by trying to get things back together.
Used a bit of paraffin oil in the ports to test the seals of each valve earlier in the week. No. 1 exhaust was the only one showing a slight leak. So my friend Ike (he has a 2600 SD1 (running well)and a 2000TC (not yet running at all) came over and we tackled lapping the valve and retesting. No more leaks!
Once I had the head back on and timing chain set up I ran another compression test. No. 3 was still low on pressure at 100psi. Bugger! I tested the rest and they were still at 180psi. I dropped a bit of oil into the spark plug hole and rerun the test, 200psi. So my guess is a cracked ring or something. Head is off again. I’ll have to order a set of piston rings and probably a new head gasket (this one was on for all of 30 mins).
So the good news is the cylinder walls all look in excellent health. No scoring or anything, a quick hone and they’ll be ready for new rings.
This was the first engine build for me a good few years ago. I wonder if I didn’t gap the rings properly when I fitted them. I guess I’ll find out and hopefully there’s no further damage. I’ll check the bores for straightness with the new rings to be sure there’s no blow by. There’s no steps at the top or anything so fingers crossed.
@harveyp6 looks like the rings could hold paraffin without pressure but was no good with air pressure. At least oil in the bored proved its piston and not valve related. I should have done the oil in the spark plug hole test the first time around.
I guess that it comes rather late as an advice, but i have built and favour a leak down tester instead of a compression tester. OK, the later will tell you that you probably have a problem, but with a leak down tester you should know somehow with more precision.
However, at the end of the day you still have to do the work. At least in your case it sounds relatively easy.
I hope so Demetris I’ll order parts today.
A bit more activity. I pulled the sump and pistons today.
No broken rings on removal, although I did break a ring when removing it from the piston.
After removing the piston rings from no. 3 I found a weird wear pattern on the bottom compression ring.
Yellow arrow shows no wear and green arrow shows wear.
There seemed a lot more carbon on the piston and in the ring lands compared to the others. I did break it when removing the ring. I wonder if it was stuck and caused irregular wear and sealing. The oil test on compression testing seems to point to a ring seal issue.
Anyways, new rings to be ordered after cleaning all the pistons. The cylinder walls were all within spec. No problems with wear after measuring ring gaps at various points on the cylinder. I did run a hone through them as the they were rather polished, that will help the new rings bed in and also help oil stay on the cylinders walls. Now just have to wait for parts to arrive.
I forgot to mention. I think the extra carbon issue may be my fault from early last year.
I had The he’d off to replace the o ring in the head gasket. It was weeping at the back as they can do sometimes.
When I did it I didn’t drain enough coolant, not realizing I loosened the head bolts, removed the cam and cam carrier and left things for a day in the garage. Next day I go out there, lift off the head and find coolant in the piston crowns. Not only that, the coolant had softened the carbon buildup to the consistency of black yogurt. I wiped it off, but now wonder if I pushed some down the sides of the pistons where they got into the ring lands and caused the problems I’m seeing. I thought I had got away with flushing the oil and that was it. Maybe not?
Separate names with a comma.