Rear main seal change

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   Hi all, 

I've had an oil leak for a while. Now finally had the boat out of the water for a while, meaning a dry bilge. 
Found some oil drip: see pic.

Looks like I'll be ordering a new rear main seal. Before I do that, is there anything else I should check that could cause leaking oil in this spot? 

To change that seal, the engine will need to pulled, right? Any tips? Anything else that should be changed/checked when the engine is out anyway? Any other info?

Thanks!

Boat is '97 NSS. 

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TRIP Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629	Post Options Post Reply Quote TRIP Report Post Thanks(0) Quote Reply Topic: Rear main seal change Posted: September-06-2018 at 6:18pm
	Hi all, I've had an oil leak for a while. Now finally had the boat out of the water for a while, meaning a dry bilge. Found some oil drip: see pic. Looks like I'll be ordering a new rear main seal. Before I do that, is there anything else I should check that could cause leaking oil in this spot? To change that seal, the engine will need to pulled, right? Any tips? Anything else that should be changed/checked when the engine is out anyway? Any other info? Thanks! Boat is '97 NSS.
	FlyZone Costa Rica Wakeboarding 1997 Super Sport

MrMcD Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3587	Post Options Post Reply Quote MrMcD Report Post Thanks(0) Quote Reply Posted: September-06-2018 at 9:39pm
	What engine do you have? What transmission, 1.23 or 1:1 it makes a difference on your seal. Some are reverse rotation and hard to find, some are standard rotation and available at any parts store. Let us know.

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: September-06-2018 at 10:06pm
	He has a GT40 Mark which are all lefty's but to confuse things it should have a PCM 1:1 . The V Drive will change the rotation of the prop to a righty. I do not envy him in the job he has !
	69 Mustang HM SS 95 Nautique Super Sport

TRIP Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629	Post Options Post Reply Quote TRIP Report Post Thanks(0) Quote Reply Posted: September-06-2018 at 10:21pm
	Hi! Yes GT40, and not even sure what trans. I read somewhere that SS's have 1:1. I emailed skidim to be sure I get the right seal. I'm NOT looking forward to this project, but it's time something's done about it, glad I finally could confirm where the leak is.
	FlyZone Costa Rica Wakeboarding 1997 Super Sport

MrMcD Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3587	Post Options Post Reply Quote MrMcD Report Post Thanks(0) Quote Reply Posted: September-06-2018 at 11:49pm
	If this is Standard Rotation and a 1997 it should be running the Full Round Rear Main Seal. The Full Round Rear mains in Standard Rotation can be replaced with a Teflon Seal made by National but sold as a National Part or as a Fel Pro part. The Teflon seals are bullet proof. They can last 1,000,000 miles, no joke. They are also more forgiving and can seal over an existing groove in a high mile engine. I know they are available for the 5.0L late model blocks and I believe they are available for the 351W blocks. 5.7L GM and 454 GM late models are covered. These are unique. They install clean and dry, no lube at all on the seal face. A plastic install tool comes with every seal. You slip the plastic over the crank and press the seal up and over the plastic till it is in place. This keeps the crank from damaging the Teflon which can scratch easy. Once installed they are bullet proof. They are about double the cost of a Standard rear main seal but worth every penny in my mind. These will not work with a Reverse Rotation engine. Teflon Rear Main Seal Fel-Pro # BS40645 Says it fits 1991-1998 BS40592 is the standard factory type rear main seal from Fel-Pro.

GottaSki Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: April-21-2005 Location: NE CT Status: Offline Points: 3327	Post Options Post Reply Quote GottaSki Report Post Thanks(0) Quote Reply Posted: September-07-2018 at 11:12am
	Don't think its been answered yet.. no, wont have to pull the engine Tap some smartly cut 2x4 under the rear of the exhaust manifolds and remove the starter, transmission and flywheel transmission is only about 100# and the fords are supported center of block so the weights involved here are minimal with determination you can do this in a full afternoon whoops, nevermind, v-drive....my err
	"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole

TRIP Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629	Post Options Post Reply Quote TRIP Report Post Thanks(0) Quote Reply Posted: September-07-2018 at 2:18pm
	Haha oh noo what a bummer! Got me excited there for a bit! :p Thanks either way.
	FlyZone Costa Rica Wakeboarding 1997 Super Sport

TRIP Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Gold Member Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629	Post Options Post Reply Quote TRIP Report Post Thanks(0) Quote Reply Posted: September-07-2018 at 3:07pm
	Msg from Skidim: "The seal is Item #1140 and they cost $64.90 plus shipping. There are no gaskets between the bellhousing and transmission so that is all you should need. " Gonna look into the Teflon version too.
	FlyZone Costa Rica Wakeboarding 1997 Super Sport

MrMcD Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3587	Post Options Post Reply Quote MrMcD Report Post Thanks(0) Quote Reply Posted: September-07-2018 at 4:56pm
	Keep in mind that Ski Dim does not manuafacture the seals. Fel-Pro does. The Fel-Pro will not work unless your engine is Standard Rotation.

Rear main seal change

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