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Removing oil injection

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sharkcrazy

Member
When removing oil injection do you also remove the driven shaft? I haven't started doing it yet I'm just thinking and trying to get my game plan together. Mariner 40 hp 4 cylinder [OG024229]. Mercury does make a block-off plate to replace the injection pump.
 
You don't need to remove the shaft or the pump for that matter - simply run an single tube from the out to the in on the pump and let it continue to run essentially doing nothing - that alleviates the need to remove and plate over to keep cooties out.

My question would be however, why are you disabling the oiler?

Although the oil injection gets blamed for everything from a single piston failure to an overheat, out of every 100 toasted powerheads the total failures caused by a bad oiler are between zero and one (1) - the system is generally pretty bullet-proof.

Additionally, if you go to mixed gas then you are always burning 50:1 (instead of the variable rate the oil pump gives you), so over a 5 or 10 year period of average use, your cost for "extra" oil will far outweigh the repair costs of fixing an oiler that has failed (and on Merc's it's pretty much restricted to the drive gear that fails and only on earlier models)....
 
Merc 90 2T 3cil -carb_ (2010) have shaft at steel or other metal , is very dificult to replase this shaft or inspec this ?? What is de more part blamed for problems in the oil inject sitem -shaft or internal gears in the oil pump_ my question would be however exist any inspection on this parts for prevent failure in this system????? without need open the powerhead ????Have some problem if add 100:1 oil 2T in gas ?????
Tks
 
Dear Galamb.
Tks for your answer ,my question refer for prevent actions , not for actual problems, the engine runn ok .
My largest fear and of having a premature break due to this system,because some perssons sai ...the oil system in Merc with carb is a big ****
Repeat,the engine operate normal.
What is your personal oppinion for this problem at this engines - 90 -two stroque carb.???
Tks again for your att.
 
The oil pump gear on some early models did have an issue but was easily remedied by installing the redesigned version.

The 2 stroke 90 horse from Merc may very well be the best selling model from any mfg for all time.

It doesn't get that distinction by being a problem plagued motor.

Most motors die due to lack of maintenance on the part of the owners - probably 99% of all failures.

The remaining 1% of problems are due to a number of components failing with no single source standing out more than others.

The oiler on any Merc produced in the last 15 years or so is one of the "least likely" to fail parts...
 
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