B7100 Rebuild

[Schmotown]

I am reassembling my B7100 engine (liners, pistons, rings, bearings, cylinder head) and did a compression test on #1 cylinder while the engine is still on my bench and was very disappointed with the reading of 240# on Cyl. #1. This seemed very low to me so I did a leakdown test on all 3 cylinders and they all show about 4% leakage. I squirted a bit of oil into #1 cylinder and got a reading of 380#. The starter was connected to my car battery and turned over quickly.

With the very good leakdown test and 380# on Cyl #1 do you think I can proceed with completing the installation or does something seem wrong with my results? I did not do a compression test on #2 and #3 as I left the lifters and pushrods out as I just wanted to see what compression I had with an aftermarket head gasket before installing the Kubota head gasket for the final assembly.

Attached is a pic of my gear assembly showing the timing mark alignment.

Thanks in advance, Larry.

 

[North Idaho Wolfman]

Well there is a lot at play here.

The rings need to be run a bit to set and get proper compression numbers.
The aftermarket head gasket will throw all the numbers off, that's why you need an OEM gasket.

I personally wouldn't worry about those numbers.
Finish up the build.

 

[Schmotown]

Thanks, Wolfman. I'll finish it up and report back with my results.

 

[Schmotown]

I finsihed the rebuild on my B7100 and drove it for about 15 minutes today. Smoked quite a bit on start up but after a couple of minutes there was almost no smoke. Ten minutes later no smoke unless I was going slow and pushed the throttle to wide open. A puff of smoke and then it would clear right up.

I'm pretty happy with the results of the rebuild and confident that the tractor is in good shape. Could not have done it without the help I received from those that responded to my numerous questions and a special thanks to North Idaho Wolfman for keeping me on track!

Thanks to All!
Larry.

 

[North Idaho Wolfman]

I finsihed the rebuild on my B7100 and drove it for about 15 minutes today. Smoked quite a bit on start up but after a couple of minutes there was almost no smoke. Ten minutes later no smoke unless I was going slow and pushed the throttle to wide open. A puff of smoke and then it would clear right up.

I'm pretty happy with the results of the rebuild and confident that the tractor is in good shape. Could not have done it without the help I received from those that responded to my numerous questions and a special thanks to North Idaho Wolfman for keeping me on track!

Thanks to All!
Larry.

Glad to hear you got it going!