View Full Version : engine/prop alignment
09-27-2011, 05:21 PM
first time on team talk. need info. replaced/rebuilt trans. in my 1985 skier. new trans housing will require engine alignment with prop shaft. know to do it on the water, but not exactly sure how adjustments are made. great mechanic assisting, but no experience at this. motor lookslike it needs raised up front, lowered at rear. cant find good description or manual . always try free first. help anyone?
09-27-2011, 10:08 PM
get the clymers manual...it has a good explanation of how to do it...
09-27-2011, 10:53 PM
The engine has mounts in the front and mounts on the transmission in the back. These are adjustable allowing the motor to be moved up, down, and side to side as required. The first step is to loosen all the mounts and lube them so they are easy to adjust.
Next, unbolt the flanges connecting the prop shaft and the transmission. Separate the shaft about 1/8 inch.
All measurements will be at the 12, 3, 6, and 9 o'clock positions. Use a set of feeler guages and meausre from each position. Ideally you should have .000 change but .003 is acceptable.
If the measurements vary then you have to figure out where to raise/lower and which direction to move the front/back of the engine and transmission until the measurements come out the same.
Might sound complicated but it just takes some finnaggalling.
09-28-2011, 12:39 AM
I'd suggest the more complete alignment procedure linked in this thread (http://mastercraft.com/teamtalk/showthread.php?t=9474).
The standard alignment that Skipper discusses above is critical, and should be done on a regular basis (every year or two), because if it's off it puts a lot of load on various mechanical bits.
The more comprehensive alignment guarantees that the propshaft is straight first, then finishes with the standard alignment. It generally only needs to be done once in the lifetime of the boat; if you're replacing the tranny, now would be a good time to do it.
09-28-2011, 09:17 AM
Here's a link to a PDF on tranny installs.
Velvet drive install guide (http://mikesell.net/images/boat/velvet%20drive%20marine%20tranny%20install%20manua l.pdf)