I got my second 8.1 back from the machine shop and was hoping to do break in run today but my (new) fuel pump is dead. I’ll swap over my other and run it hopefully tomorrow.
One item on my punch list was one of the crank mounted pumps which has a wobble. They’re Sherwood P110’s. Since i was rebuilding two engines, I put that on the punch list for later. In the meantime, I ordered a brand new one and rebuilt one of the others to use on the second engine or as a spare. The brand new one is installed and just in the process of cranking it over today, I could see the same wobble as the old (now rebuilt one). While the engine was at the machine shop I mentioned this so he checked the crank/pulley and said they were ok. I haven’t grabbed my dial indicator to check his work and will do that next.
On the 8.1’s, I don’t believe there is a wrong way to install these pumps, meaning there is no indexing. The pump mounts flush inside the balancer and installs with three bolts. I can feel it bottom out by hand before I install the bolts. The other engine runs true.
If the balancer is really running true and the issue is some defect in the mounting points, can I shim that out so it runs true? Probably a lot of trial and error to get it right. Or, am I missing some indexing and just got lucky on the other engine? There are only three holes in the pump and crank.
My nightmare scenario is that the crank snout is slightly bent followed by a bad crank pulley which wouldn’t be nearly as bad. And the million dollar question, does it really matter? If the shaft is running true inside the pump but the whole pump is wobbling within the balancer, do I care?
thanks
Bob
One item on my punch list was one of the crank mounted pumps which has a wobble. They’re Sherwood P110’s. Since i was rebuilding two engines, I put that on the punch list for later. In the meantime, I ordered a brand new one and rebuilt one of the others to use on the second engine or as a spare. The brand new one is installed and just in the process of cranking it over today, I could see the same wobble as the old (now rebuilt one). While the engine was at the machine shop I mentioned this so he checked the crank/pulley and said they were ok. I haven’t grabbed my dial indicator to check his work and will do that next.
On the 8.1’s, I don’t believe there is a wrong way to install these pumps, meaning there is no indexing. The pump mounts flush inside the balancer and installs with three bolts. I can feel it bottom out by hand before I install the bolts. The other engine runs true.
If the balancer is really running true and the issue is some defect in the mounting points, can I shim that out so it runs true? Probably a lot of trial and error to get it right. Or, am I missing some indexing and just got lucky on the other engine? There are only three holes in the pump and crank.
My nightmare scenario is that the crank snout is slightly bent followed by a bad crank pulley which wouldn’t be nearly as bad. And the million dollar question, does it really matter? If the shaft is running true inside the pump but the whole pump is wobbling within the balancer, do I care?
thanks
Bob