Oil injection delete on 1989 Mercury 2.4 200 (V-200)

**dirtmaster37** · 06-06-2019, 10:20 AM

I'm sure this question has been asked but i want to delete the oil injection on my 1989 Mercury 2.4 200 (V-200). Is it as simple as just taking off all the components and plugging the holes? Is there a kit you can buy? Thanks for the help!

**slpcamaross97** · 06-06-2019, 01:22 PM

Welcome Dirtmaster.

I have the same engines as you do. I would really recommend removing it. I was totally against it until a close friend twisted my arm to remove it. Im really happy i removed it. My boat has twin engines. One of the oil injection pump input shafts seals were pushed half out leaking oil into the crankcase. Checked the oil supply line from the remote tank, and this was causing problems too.

So i used the oil pump blockoff kit https://www.amazon.com/Block-Screws-.../dp/B01LZXTP7H.

You will also need a few block off plugs, I think 3/8 npt plug and 1/16.

Removal of the warning module and oil injection tank.

Premix it and you are off to the lake.

**slpcamaross97** · 06-06-2019, 01:48 PM

Also add a water pressure gauge to your motor. Helped out with my cooling issue.

**vnemous** · 06-06-2019, 02:58 PM

Oil Injection System Removal

The mercury oil injection system is a popular item to remove, especially given its reputation for failure, and inability to deliver reliably after 6500 rpm.
Remove oil resevoir, oil pump, mag pickup, pump drive shaft, then install plug in shaft hole. Remove oil hose off bottom of vapor seperator, plug hose, remove fitting on starboard side of the block where oil tank pressure hose is coming from, plug hole with pipe fitting either 1/8 or 1/4., Remove oil alarm box, and i think that's all. the plug for the pump shaft hole you will have to get from dealer. (12)
Mercury part number for the plastic block off plate is 43453 and the O-ring for that kit is 32509. Jay Smith Racing Engines also has a billet kit for doing this.
Finally it is recommended by several sources, that you keep the old oil pump gear on the crankshaft, as it provides crankcase volume, and if removed will cause that cylinder to be lean.

**dirtmaster37** · 06-09-2019, 12:31 PM

Thanks!

**NC 1750XLVEE** · 06-12-2019, 09:29 AM

If you are using the merc block off kit dont you remove the ateel oil pump drive gear as well? Thought the gear had to be removes for the plug / kit to fit?