225 Merc oil pump drive gear

[Perfidiajoe]

I own a '95 225 XRI EFI since new. It has a ligit. 500 hours on it. I have had very little trouble w/ it in the 10 seasons I have it, I don't usually beat on it, & do all my own work, as I have been a auto, truck, & Equipment mechanic for the last 35 years. I read a few posts here about the oil pump drive gear, I have had no trouble so far w/ mine. Should I think about changing mine, is there an upgrade, or should I just hope for the best w/ this one. Is this the same job before & after it the gear goes bad? I haven't looked at the service manual yet, as I just became aware of this potential problem this morning when I first found this forum. Thanks for any Info.

 

[rabidfish]

Re: 225 Merc oil pump drive gear

Post your serial number... we'll check bulletins for you...

 

[Perfidiajoe]

Re: 225 Merc oil pump drive gear

I believe the serial # is 1225413RD 06245497, Those are the #'s on the card that came w/ the engine. Thanks, Joe

 

[Scali]

Re: 225 Merc oil pump drive gear

Why not inspect it Joe ?<br />From what I've read theyre made of plastic & do strip out when rust is present by the drive gear due to lack of fogging spray while winterizing.<br />Another thing I've heard is it seems to happen with motors the run WOT very often.<br />Another tip, something I just did to mine is most oil injection faliure is due to the plastic tubes { oil lines } drying out & cracking, easy to change. <br />I was going to yank mine but changed my mind.<br />When I get a chance I may pull the pump & inspect mine this year to be on the safe side..<br />Another thing some people do is run 100-1 ratio oil in the gas tank as a backup & dont WOT it this will prevent the engine from blowing if the inj. fails as the oil inj. ratio varies from 100-1 @ idle to 50-1 @ WOT anyways & it shouldnt produce too much excess smoke & carbon.

 

[Perfidiajoe]

Re: 225 Merc oil pump drive gear

I have no problem with it now, my thought is when I have the pump out for inspection, should I just replace the gear, or is the gear that goes bad not on the pump? I've taken pretty good care of this engine, I have flushed it w/ salt away after every use, use only 89 octane fuel, Merc premium plus oil, some form of carbon guard w/ every tank of gas, & power tune every year. should I pull this & look at the gear, & is there an upgrade(bronze or brass) gear. Thank You, Joe

 

[rabidfish]

Re: 225 Merc oil pump drive gear

No bulletins stand out. <br /><br />If it were my engine, I'd...<br /><br />Rebuild the fuel pump(just for good measure)<br />Replace the fuel primer bulb(use the "Mercury" one with the yellow identifier)<br />Replace the oil line running from the oil pump to the fuel line<br />Replace the oil check valve while you're at it.<br />Remove the oil pump and inspect the gearshaft. <br />Replace the plastic drive bushing.<br />Replace the oil "feed" line.<br /><br />If everything looks ok after that, then run it without fear.

 

[Scali]

Re: 225 Merc oil pump drive gear

Ive seen the drive gear listed @ the Merc express site & theyre cheap.<br />This cant be too hard of a job to change, I would be tempted just to put in a new one every couple years.

 

[wilde1j]

Re: 225 Merc oil pump drive gear

Drive gear replacement requires complete powerhead teardown [The gear is pressed on the crankshaft]. Just remove pump and inspect the driven shaft for any plastic shards. There's an electronic pump drive aftermarket replacement for ~$325 if you have a problem and want to retain the oil injection system and alarms.

 

[Scali]

Re: 225 Merc oil pump drive gear

my '94 40 hp the oil pump drive gear is right behind the pump, guess these high HP brutes are different

 

[Perfidiajoe]

Re: 225 Merc oil pump drive gear

Thank You to all, as I said I don't have a problem, but will be looking at this now before it becomes trouble. What would be the normal cause of this? Anything further is also welcome. Thanks again, Joe

 

[rodbolt]

Re: 225 Merc oil pump drive gear

without checking the manual I belive the gear is the two pice nylon one that goes about the center of the crank. I dont think any of the V mercs used a press on gear. but as long as proper storage procedures are used)storage over 30 days) they usually live a lot longer than the cheesy vynil oil lines. a quick look at your service manual will tell ya.

 

[Perfidiajoe]

Re: 225 Merc oil pump drive gear

Thanks, to all. I checked the service manual, for the info. took a look at the pump drive & what I could see of the drive gear, all looked fine. Again Thank You, Joe

 

[jeffpalmer@earthlink.net]

Re: 225 Merc oil pump drive gear

Hey WildeOne: Where can I get the electronic pump drive system you mentioned?<br /><br />Thanks

 

[wilde1j]

Re: 225 Merc oil pump drive gear

Try API Marine 800.327.6086. This is a wholesaler, selling to dealers. The model years covered are '89 thru '99 carbed and EFI 135 to 200 V6's.<br /><br />See also for more info:<br /> http://www.pamlicomarine.com/msi-eoi.shtml