Help!!!! Oil leak

JakesRinker300

Hello guys and gals. Have a new to me 1995 300 with twin 5.7 mercruisers. Have only had the boat a couple weeks and been out maybe a total of 4 hrs. I checked the oil before our first quick outing and levels were good. Took the boat for a longer 1.5hr cruise and when we got back to our slip I wanted to check the bilge to see if we took on any water. To my dismay I found oil and lots of it. Checked both dip sticks and almost none showing on either. I’ve started feeling around the engine and found there to be quite a lot of oil on the right side below the exhaust manifold. These engines have the remote oil filters and I’m wondering if maybe I’ve got leaks. Both engines are oily on the right side below the exhaust manifolds. Are these remote filters possibly the problem?  Help!  Thanks in advance  

Jake. 

aero3113

Welcome to the forum!

Yes, remote oil filter and lines can be the issue. There are 2 seals where the remote adapter is. My starboard engine was leaking there before I replaced the seals. I also had an oil line crack on me!! 

JakesRinker300

Wow thanks for the quick reply. Can the remote adapter be accessed without removing the engine? Can the lines be changed easily?  

aero3113

On my 2008 330 I was able to access them with the engines in.

aero3113

@JakesRinker300 , if you can do what @Alswagg suggests that’s an easy fix! And if you can access your filters without the adapters, I would just leave it like that. One less thing to worry about failing. 

JakesRinker300

How do I go about removing the adapter?  I can barely see it. I can get my hand on it. Remove the lines first?  Does the adapter thread on like a filter? Or is it bolted into the block somehow?

aero3113

@JakesRinker300 , look at the 4th pic. That’s how the adapter is fastened. Yes, the lines have to come off first.

JakesRinker300

aero3113 said:

@JakesRinker300 , look at the 4th pic. That’s how the adapter is fastened. Yes, the lines have to come off first.

You don’t happen to remember the wrench size for the nut for the adapter do you?  I don’t have anything that big and will need to guy buy one and I don’t want to guess. 

aero3113

Sorry, I don’t remember! But I do remember it’s bigger than 1”.

JakesRinker300

aero3113 said:

Sorry, I don’t remember! But I do remember it’s bigger than 1”.

All good. Just used a big adjustable wrench. 

aero3113

JakesRinker300 said:

aero3113 said:

Sorry, I don’t remember! But I do remember it’s bigger than 1”.

All good. Just used a big adjustable wrench. 

There ya go!! 👍🏻

JakesRinker300

Having a hard time finding part numbers for these oil lines. How would I go about looking these up?  Looked into getting them made up at a hose shop but no luck. 

aero3113

I was able to have them made at a local hose shop, 2 days before I was scheduled to launch (that’s when the hose blew on me). I used them for a few months then replaced them when I bought OEM. First pic is of the lines from the hose shop. Part numbers for OEM are below.  

aero3113

I would think there’re the same part number for your year as well. 

aero3113

Maybe if you search the part numbers they will list the years.

JakesRinker300

Can anyone tell me where the oil sender is on this motor?  It’s the 5.7 bravo carbureted. 

aero3113

JakesRinker300 said:

Can anyone tell me where the oil sender is on this motor?  It’s the 5.7 bravo carbureted. 

Right hand side of the block towards the back (when looking aft towards the stern).

JakesRinker300

Aero on top or bottom of the motor?

aero3113 said:

JakesRinker300 said:

Can anyone tell me where the oil sender is on this motor?  It’s the 5.7 bravo carbureted. 

Right hand side of the block towards the back (when looking aft towards the stern).

YYZRC

On my Volvo it was on the top. Mine had a crack in the elbow fitting that leaked a fair bit. Took a while to track it down. 

Pat310

Part C in diagram. Right above where non remote oil filter would be

JakesRinker300

So Pat, standing in front of the engine (pulleys belts) it would be on the bottom right, at the back. Just above where the remote filter adapter is correct?

Pat310

yup 👍 

PickleRick

If you don't already own a bore scope aka endoscope get a cheap one on ebay/Amazon. 

You'll want it for multitude of boat maintenance,  examination and repairs.  

Prefect for helping to find leaks between 2 engines you don't fit between. 

JakesRinker300

Thanks for the suggestion Rick. I’ve ordered one, will be here tomorrow. Obviously I won’t be able to confirm my repair until the boats in the water and running again. COME ON MAY!!! 🙏lol

PickleRick said:

If you don't already own a bore scope aka endoscope get a cheap one on ebay/Amazon. 

You'll want it for multitude of boat maintenance,  examination and repairs.  

Prefect for helping to find leaks between 2 engines you don't fit between.