Leaky Timing Case cover Oil Seal Repair

[bsadek]

I have a 2000 Bayliner 3055 with Twin Mercruiser 5.7 Liter V8 engines. The starboard Timing case cover oil seal is leaking. I assume I have a bad seal. Could my crankcase be not venting correctly and being over pressurized? The motors have about 125 hours on them. I want to know how difficult it is to replace the oil seal. Do I need to pull the engine and oil pan to replace the seal or can I just pull the timing case cover with the engine in the boat?<br /><br /><br />Supersabre

 

[Don S]

Re: Leaky Timing Case cover Oil Seal Repair

Do you have the sheetmetal timing cover with the standard timing degree tab that looks like this:<br /><br />

<br /><br />Or do you have the composite cover with a timing mark like this on the timing cover, the decal goes on the vibration dampner:<br /><br />

 

[bsadek]

Re: Leaky Timing Case cover Oil Seal Repair

Tough question, the boat is a 125 miles away.o I can't tell you right now.<br /><br />Can you give me the news on both scenerios?<br /><br />Supersabre

 

[Bondo]

Re: Leaky Timing Case cover Oil Seal Repair

If it's the metal cover,.....<br />A Good Wrench can Cheat it off,+ back on,...... Maybe without another oil leak from around the base........<br /><br />It's Made to be installed Before the Oil Pan,.... And That is an Out of the Boat experience,........ <br />

Could my crankcase be not venting correctly and being over pressurized?

Nawww,... I Really Doubt it,.........<br /><br />You don't say where you call Home,.... But I'm betting that you boat in Saltwater,....<br />And,.. The Timing Cover is Rusted Through,....<br />Not the Seal............<br /><br />Good Luck,... And Welcome to the forums here at iboats.com..............

 

[bsadek]

Re: Leaky Timing Case cover Oil Seal Repair

I may be able to get the boat this week end, will check out whether the timing case is steel or aluminum.

 

[DHPMARINE]

Re: Leaky Timing Case cover Oil Seal Repair

SuperSabre,<br />Sounds like quite the boat.Both Don S.and Bondo are giving you good advice.And I bow to them,as they have far more experience than I do. (but I still add my 2 cents here and there )<br /><br />If the cover is metal,and you are salt water or not,do both engines.Also think about venting your engine compartment better if you see alot of condensation on it when you open it first thing in the morning.Maybe even prop up the engine lid (when not in use)a bit for circulation.<br /><br />DHP

 

[Don S]

Re: Leaky Timing Case cover Oil Seal Repair

If you have the steel cover, you can replace the front seal without pulling the timing cover. If it's the cover, it's best to pull the engine on either kind, but the steel one can have the corners of the flange that holds the oil pan seal in place cut off so the cover can be changed. Not a good idea, I have seen a few leak at the pan corners after that.<br />IF it's the composit cover (NOT aluminum) the seal is not replaceable, the complete cover has to be replaced, and you have to pull the pan.

 

[bsadek]

Re: Leaky Timing Case cover Oil Seal Repair

Thanks for all the comments. I am going down to the boat in a couple of weeks. I will post the results when fixed.