02-05-2013, 11:27 AM #1
Opinions on pump shoe alignment please
Please only answer if YOU have done this before. So many different opinions depending on who's thread you read and comments.....
Gerry if you get to see or read this please help as your thread was the most useful!
Do I need to remove and shim the shoe of is mine close enough?
Pic one is from a reference point on the hull to a fixed point on the shaft. Pics 2 & 3 show the measurment.
02-05-2013, 11:30 AM #2
02-05-2013, 11:47 AM #3
If your alignment shaft is close to being centered all the way around your thru hull fitting..... you probably won't get it much better. Getting absolute perfect pump shoe alignment is tough! You can shim it up, and get it perfect by test fitting it..... but when re-installing it with the sealant, it will change slightly. You have to apply the sealant as evenly as possible, and hope for the best.
I wouldn't recommend re-using your shoe after you pull it off..... you'll see why if you attempt to pull it!
02-05-2013, 12:09 PM #4
I am hoping not to have to pull it.
If I end up pulling it I will replace with new and find some way of using a laser to true it to the hull / transom / rideplate so that the hull is pushed through the water 100% straight and treat the thru hull / carbon seal / engine alignment as a completely separate issue.
Like I said I hope not to have to pull it off and save myself a load of hassle!
02-05-2013, 01:33 PM #5
If its off, then its off. Fix it!!! I used a heatgun, screwdriver, 2 prybars, and a big hammer......the shoe came off in one (1) piece!
From the factory there were 2 shims, 1 left and 1 right on the bottom bolts. A test fitting alignment of the shoe to thur hull seems to want 2 shims on the upper right bolt; the alignment shaft is centered!
02-05-2013, 01:38 PM #6
It's off by a tiny fraction but only on the through hull by my calculations. it is correct for the transom / hull which makes me think that the through hull is slightly out of line and not the pump shoe to transom.
This is why I posted so many pictures to get others opinions of the calculations etc.
02-05-2013, 01:54 PM #7
According to Jerry's thread on this matter, its more important for the driveshaft to be centered in the thur the hull fitting than the transom. Reason: the floating ring/carbon seal will be squared; to fit flush and evenly to each other and to reduce cavitation. Its also what keeps water out.......prevents sinking!
02-05-2013, 02:45 PM #8
Not sinking is good, very good and this is coming from me who has sunk before and I get the carbon seal thing. I am thinking with going with one of the alternative sealing methods. Who knows at this stage.
What I am trying to achieve at this stage it a completely square drive train to hull / rideplate so no power is lost by constantly pushing the craft sideways, even by a degree or two.
Thanks again TommyG for the assistance.
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