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175 evinrude drive shaft spline

E

Ed

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"on my 175HP 83 rude, notice s

"on my 175HP 83 rude, notice some paralles wear toward the bottom my mt drive shaft spline where it mates up to the crankshaft. it appears that the crankshaft teeth is digging into the driveshaft spline.

move the drive shaft radially and notice some play, is this normal or do i have a worn pinion bearing bering etc? thanks"
 
"Ed.... I've read your pos

"Ed.... I've read your post over a few times but am having a problem understanding exactly what you're trying to get across to us.

Are you saying that the top driveshaft splines are wearing down along with the crabkshaft splines? If so, that is caused by someone installing the driveshaft without installing the top driveshaft "O"Ring along with failing to grease the top driveshaft splines. Water, rust, friction will tear those splines apart.

The second portion of your post.... if you're speaking of moving the driveshaft sideways with the water pump removed. The new style two piece driveshaft will move quite a bit. The one piece drive shaft should not move sideways at all."
 
"Joe,

yes, the driveshaft

"Joe,

yes, the driveshaft splines are wearing along with the crankshft spline. the wear is more pronounce towards the bottom on the driveshaft (close to the lower unit)

i have a one piece driveshaft. if i hold the spline of the driveshaft, i can move it sideways a little. maybe 3 to 5 thousands of an inch.

wonder weather this movement had cause the spline wear?

thanks
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"The few thousands that you ca

"The few thousands that you can move the driveshaft at the top lower unit DS bearing/seal assy wouldn't have anything to do with the top driveshaft spline wear. If it was excessive, it would allow water to enter the lower unit. That spline wear would be caused by either what I mentioned above or a bent exhaust housing (long hsg between the powerhead and lower unit). It could also be related to a worn lower crankshaft bearing, possible and something you shouldn't overlook.

Pertaining to the exhaust housing. There is a tolerance percentage of 10% of being out of alignment (bent). Anything over that will cause that spline damage, but it usually causes the drive shaft to break just under the water pump first.

With a new drive shaft installed (and you need one), you can tell if the exhaust housing is bent simply by sliding the lower unit up and into the crankshaft splines, but not tightening the lower unit retaining bolts, then looking at the clearances between the top lower unit surface and the bottom surface of the exhaust housing as you push the lower unit up by hand. If it's bent, looking at that clearance closely, you'll see a greater clearance on one side than the other.

I'd strongly suggest that you remove the powerhead to check that bottom main bearing. Unfortunately you're also eventually going to need a crankshaft."
 
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