What am I looking at on my '83 150?

[ratlsnaktj]

I was going over my engine the other day and noticed something I had never seen before. On the side of the motor, more towards the carbs there are 3 little elbows on each side of the engine with a hose attached to them (they appear to be at the base of each cylinder). The hose is flexible and about 1/4 ID. From what I can tell the hose just connects to the same elbow location on the other side of the motor. There was no fluid in them so I can't really tell what they are. Any ideas?

 

[gss036]

Re: What am I looking at on my '83 150?

Those are the bleed hoses. They are designed to return excess oil to the engine block. Usually the lines start behind the carbs and then goes to the block.

 

[j_martin]

Re: What am I looking at on my '83 150?

Those are the bleed hoses. They are designed to return excess oil to the engine block. Usually the lines start behind the carbs and then goes to the block.

Without them it'll idle rough, If they're in questionable shape, now's the time to freshen them up. Most use tygon line from the local chain saw shop. There's usually a small check valve associated with each line that can hang either open or closed. Worth checking if you're changing hoses.

hope it helps
John

 

[ratlsnaktj]

Re: What am I looking at on my '83 150?

This engine is not oil injected, its a straight 50:1 mix. Do engines without oil injection have the bleed hoses?

 

[j_martin]

Re: What am I looking at on my '83 150?

This engine is not oil injected, its a straight 50:1 mix. Do engines without oil injection have the bleed hoses?

Yes. Post #2 should read fuel instead of oil. Actually, fuel tends to puddle up behind the carbs . The bleed lines allow it to be pulled out a little at a time into the opposite cylinder. (in the timing cycle) Without them, idle tends to go to chit, and on some engines, most notably the inline 6's, they actually route directly to main bearings to keep them wet and cool.

They need to be there, and they need to be in good shape.

Are you having some trouble with your engine that we can help you with?

hope it helps
John

 

[ratlsnaktj]

Re: What am I looking at on my '83 150?

I just wanted to make sure we were talking about the same thing before going further.

One of the fittings is broken off right at the block. I'm not quite sure how the best way to fix that is. It looks like the fitting is actually cast as part of the block. I was thinking I could probably use some aluminum epoxy putty on it. I'd obviously have to block the hole to make sure any doesn't ooze and obstruct the flow. Is that a satisfactory repair or is there another route I should try?

 

[Scaaty]

Re: What am I looking at on my '83 150?

There is a small tiny jet/orifice in there, and they are needed...

 

[j_martin]

Re: What am I looking at on my '83 150?

I just wanted to make sure we were talking about the same thing before going further.

One of the fittings is broken off right at the block. I'm not quite sure how the best way to fix that is. It looks like the fitting is actually cast as part of the block. I was thinking I could probably use some aluminum epoxy putty on it. I'd obviously have to block the hole to make sure any doesn't ooze and obstruct the flow. Is that a satisfactory repair or is there another route I should try?

It's not part of the block. It is a replaceable part. It might be threaded in, or pressed in. Either way, it needs to be replaced.

Start by going to mercruiserparts, usboatsupply and looking up the parts list for your motor.

hope it helps
John