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#1
IP: 71.120.233.70
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Just how critical is engine coupler alignment?
Not sure what the best forum for this would be. . .
So anyways, I dropped the block less accessories into the boat last week. I let it settle over night and aligned it. Pain in the ass it was, but I got it to .002". I bolted everything back up to it less the exhaust and checked the alignment again. . .it was off by .005" So I realigned it, got it to .003". After installing the exhaust, I checked and it was less than .002" Sweet! Bolted it up and called it good. So I was running the engine for the first time yesterday, and it was squealing when put in gear. Squeal didn't go away when I tightened the belts, so I detached the shaft coupler to check for true. . .it was less than .002", so still good. I then ran the engine without the prop shaft and no squeal. I checked the alignment once more when I hooked the shaft back up and it was off by .005"!! ***? If the alignment can be throw off just by touching the motor, just how critical is it? Am I missing something? I am an anal-retentive perfectionist, maybe that's the issue |
#2
IP: 97.93.94.201
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What size haft and how long? The changes could be from the engine settling. The squeal should be identified, IE packing or strut? Could be just a tight packing.
Dave Neptune |
#3
IP: 71.120.233.70
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1" shaft. . .40" long I think. . .
How long does the engine take to settle? As for the squeal, I found a new square key in a plastic baggy when I was cleaning up I can't remember if I put the old key back in the new drive coupler or not. . .oh, the adventure continues, lol. |
#4
IP: 107.0.6.242
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Is the boat in the water?
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#5
IP: 71.59.69.172
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I won't pretend to speak with any authority on this but will ask a question that may hall answer the original question as to how perfectly aligned the shaft engine must be.
If an engine is mounted on vibration absorption mounts, which are basically a steel ball in a hard rubber socket, how much movement will be allowed in the engine by the mounts. I would guess much more than .005". I would also hazard to guess that an average shaft could be forced to shift off center by .005" inn the coupling when a single set screw in tightened. I assume the transmission is in gear and the shaft is spinning ? Could the squeal be a better out shaft packing? Careful you might be eating up the shaft in the packing?
__________________
Bill 1974, Tartan 30, Unchained Melody www.CanvasWorks.US |
#6
IP: 68.111.8.83
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Put a finger on the packing gland while the shaft is turning (or use an IR thermometer) to see if the packing is running hot. Also what is the drip rate through the packing gland?
I presume the boat is in the water? TRUE GRIT Last edited by JOHN COOKSON; 06-22-2015 at 02:44 AM. |
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