Best way to find source of transmission leak

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   Hi,

I am owner of a Ski Tique which runs just fine (normally)  
Last season I noticed that the transmission starts to leak resulting in red oil in the bilge as well as a slipping transmission after some skiing session.

The boat is now winterized. What would be the best way to find the leak while the boat is out of the water? Do you think I can find the leak with just the motor running without turning the prop and having load on the transmission? I don't think it is the cooler. From what I can tell it is related to the tranny side of the motor. Once I had some red oil coming out of the motor airing (as far as I can tell). Hopefully it is just one of the oil seals.

Motor is PCM 351, tranny is Warner 71C.

Thank you for any hints  

Martin  

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meezar Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: July-08-2012 Location: Germany Status: Offline Points: 11	Post Options Post Reply Quote meezar Report Post Thanks(0) Quote Reply Topic: Best way to find source of transmission leak Posted: March-21-2017 at 8:34am
	Hi, I am owner of a Ski Tique which runs just fine (normally) Last season I noticed that the transmission starts to leak resulting in red oil in the bilge as well as a slipping transmission after some skiing session. The boat is now winterized. What would be the best way to find the leak while the boat is out of the water? Do you think I can find the leak with just the motor running without turning the prop and having load on the transmission? I don't think it is the cooler. From what I can tell it is related to the tranny side of the motor. Once I had some red oil coming out of the motor airing (as far as I can tell). Hopefully it is just one of the oil seals. Motor is PCM 351, tranny is Warner 71C. Thank you for any hints Martin

8122pbrainard Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045	Post Options Post Reply Quote 8122pbrainard Report Post Thanks(0) Quote Reply Posted: March-21-2017 at 9:13am
	Martin, It's the slipping that's more concerning than the leak. When you get the slippage, have you checked the fluid level? Low due to the leak? It sounds like a rebuild is needed. A front seal leaking is an indication of a worn pump. Have you tried to locate anyone in the area who can rebuild the trans? When looking, do some research as to the background/history of the shop. We have had members who have had bad luck with so called "transmission experts".
	54 Atom 77 Tique 64 X55 Dunphy Keep it original, Pete <

meezar Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: July-08-2012 Location: Germany Status: Offline Points: 11	Post Options Post Reply Quote meezar Report Post Thanks(0) Quote Reply Posted: March-21-2017 at 6:10pm
	8122pbrainard, thank you for your answer. You are right. The slipping is more concerning. It is indeed that the level is too low after after an hour or two on the lake pulling some weight. That is why it is slipping. If I add oil it tranny directly runs fine. I also thought about having a rebuild I am located in Germany and "experts" are really hard to find. So that was why I was thinking about checking the seals first. But truly I don't want to ruin the transmission.

SNobsessed Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102	Post Options Post Reply Quote SNobsessed Report Post Thanks(0) Quote Reply Posted: March-21-2017 at 8:17pm
	If you're mechanically inclined, a DIY rebuild is worth a try. You can buy rebuild kits & also a shop manual. Seems like there were a few secret rebuild tricks shared by our old tranny expert, Search the site for tranny rebuild & you will most likely find them. Good luck
	“Beer is proof that God loves us and wants us to be happy.” Ben Franklin

meezar Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: July-08-2012 Location: Germany Status: Offline Points: 11	Post Options Post Reply Quote meezar Report Post Thanks(0) Quote Reply Posted: May-24-2017 at 11:58am
	So I will do a rebuild and hopefully stuff the leak when replacing the seals :) btw: What would be a good fitting kit? The tranny is a BorgWarner 71C. I found a kit from Sierra Marine parts# 18-2591. Is it any good?

Gary S Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096	Post Options Post Reply Quote Gary S Report Post Thanks(0) Quote Reply Posted: May-24-2017 at 1:36pm
	Do a google search look for Duane in Indy. He just did his. If Ken does not beat me I can look for links later for parts. There is a nice YouTube video from the Mastercraft site on how to do it.
	69 Mustang HM SS 95 Nautique Super Sport

Duane in Indy Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578	Post Options Post Reply Quote Duane in Indy Report Post Thanks(0) Quote Reply Posted: May-24-2017 at 1:40pm
	This paper version of the manual would be a big help. VELVET DRIVE marine transmission service manual 71C-72C direct and reduction eBay item number:322526006767 Also very helpful: This is a picture tutorial that was also a big help. https://www.mastercraft.com/teamtalk/showthread.php?t=53874 I used this kit from "worldwidepartsoutlet" $146.00 Velvet Drive Marine 70C 71C 72C 1017 1018 Transmission Master Kit Stage 2 The front input shaft seal in the Alto kit is rubber coated even on the outside diameter and I would highly suggest NOT using that seal. I can provide the alternate part number for that seal that is not rubber coated. It is not that difficult to rebuild if you are mechanically inclined. You will need a press. Also a special tool kit would be helpful although you can get by without it. If you can't come up with the kit over there then contact me (via PM) as I produce them. Good luck, Duane
	Keep it as original as YOU want it 1978 Mustang (modified)

meezar Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: July-08-2012 Location: Germany Status: Offline Points: 11	Post Options Post Reply Quote meezar Report Post Thanks(0) Quote Reply Posted: May-25-2017 at 4:33pm
	Guys, you rock! How value able that information is. I am from Germany so getting those parts is a bit difficult. I don't have a press (yet). I am talking to two service partners about my problem and see where this leads. Don't want to spend too much money if the parts are around $150. But hopefully they can seal my tranny again. I will keep you posted. Thanks for the help!

Best way to find source of transmission leak

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