Do you have any idea for the NB?
Don't want to start a new thread but been missing clemsonfor, he hasn't posted since May. Unlike him.
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- Thread starter mrrooj
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Do you have any idea for the NB?
Don't want to start a new thread but been missing clemsonfor, he hasn't posted since May. Unlike him.
California
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No, no idea. 'NA' occurred to me because the compression spec is a little higher than some of those other engines listed. While an engine designed for a turbocharger will sometimes have a lower compression ratio.
This is whats in the service manual im using:
Shared album - Eric Rujiraviriyapinyo - Google Photos
Shared album - Eric Rujiraviriyapinyo - Google Photos
Yes, I read that, but that does not explain your plain engine tag with NB on it.
Thats true but wanted to point out that NA means Diesel in that manual and not Naturally Aspirated. but who knows, i cant find a lot info on my specific motor.
So i got the head off, everything to me looks as expected except that the middle cylinder (with the lowest compression numbers). When i rotate the crank and watch the pistons move i noticed that the middle piston does not come flush to the deck. It sits maybe a 1/16ish below. The other two piston heads come to the top and maybe even a hair proud. Maybe that explains the lower compression? also what would be the cause for this?
Cleaning the head and block were a lot more difficult than i thought it would be, there was very hard to remove bits on it, I still think it needs more cleaning but the only way i could get it off was with some WD40 and a razor blade. When i scraped against some areas it was like a silver-ish compound , i thought i was scraping the metal at first but it eventually comes off to reveal the cast iron. I see some hairline scratches from me scraping at it, i hope thats not going to be an issue. But overall it looks better than what i was expecting to see from some other forum post/ youtube videos of older tractors. I tried to identify where the head gasket had failed but it wasnt obvious to me.
about to make an order for the gaskets and bolts but a little worried about that middle piston now. should i be?, should i attempt to remove the cam and inspect or piston?
And do you think that i should spend more time cleaning up the surfaces? and what works best for you guys?
piston #1
Shared album - Eric Rujiraviriyapinyo - Google Photos
piston #2
Shared album - Eric Rujiraviriyapinyo - Google Photos
piston #3
Shared album - Eric Rujiraviriyapinyo - Google Photos
Head with the gasket on:
Shared album - Eric Rujiraviriyapinyo - Google Photos
Head cleaned up:
Shared album - Eric Rujiraviriyapinyo - Google Photos
Block prior to cleaning:
https://photos.app.goo.gl/KCAULVMTeefTGN6W7
Block cleaned up:
https://photos.app.goo.gl/UdGGjKw7JnTA3zT19
CoyPatton
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I think you should be very concerned about that #2 piston not coming to full height! Yes that would indeed affect your compression numbers as the gasses are less compressed. There is something wrong lower in the engine causing this condition.
Some possibilities—failed wrist pin on rod and piston connection; broken and pieces of the rod to crank shaft bearing missing; bend rod; and on.... Any of these conditions could explain your abnormal noise you mentioned.
Bottom line now is to pull the oil pan to see what you find.
Make your parts list, but do not order yet.
well removing the plate on the oil pan was easy enough but there is a drive shaft blocking the oil pan. How do you remove that? if thats out of the way then i think i can drop the entire pan.
not so good looking stuff in the pan:
Shared album - Eric Rujiraviriyapinyo - Google Photos
video: Shared album - Eric Rujiraviriyapinyo - Google Photos
not so good looking stuff in the pan:
Shared album - Eric Rujiraviriyapinyo - Google Photos
video: Shared album - Eric Rujiraviriyapinyo - Google Photos
Don't know whether you got the drive shaft off or not. Pretty sure it is similar the this one. Lot's of pictures if you need them. Clunking in 4WD - what could be wrong? - Yanmar Tractor Support Message Board