Oil injection reliability?

[D Green]

Recently purchased boat has a 1993 90h.p. Mariner with oil injection on it. I have heard some people quit using the oil injection and start mixing after the motors start getting up there in years. <br /><br />Should I keep using the injection or mix?

 

[Laddies]

Re: Oil injection reliability?

The engine will some times strip the oil pump drive gear and self destruct, I guess that depending on the engine hours and how deep your pockets are, will detremine what your decision is on the system

 

[rodbolt]

Re: Oil injection reliability?

hello<br /> never heard of a stripped gear on a 90. could happen I guess but I have only seen it on poorly maintained v6's that used a nylon gear.<br /> the big thing on all merc oil injections is to replace all those chintzy vynil lines every 3 or 4 years before they break.

 

[D Green]

Re: Oil injection reliability?

Suppose there is a gear stripped or a broken oil line. Is there any warning that the oil supply has been shut off?

 

[rodbolt]

Re: Oil injection reliability?

nope<br /> the only warning is the low tank alarm on that motor. the v6 motors used a rotation sensor cause the "ang a neers" knew the nylon gear would be failure prone. I believe all the inline motors used a brass gear like the rest of the world. usually what kills the nylon gear is rust on the driven gear on the v6. a small bit of rust due to improper storage will eat the nylon rapidly. but all the mercs that used a block mounted pump used and still use them motor killing vynil lines. replace them if they get the least bit hard and they never give problems.<br /> its always cheaper to do pro-active maint rather than reactive maint.

 

[Laddies]

Re: Oil injection reliability?

Rodbolt, I have repaired two with nylon gear that were striped, both the early style power heads with crank guided rods--Bob