Thread Tools Search this Thread
Old 09 July 2006, 03:56   #1
Country: Greece
Town: Athens
Make: Wave
Length: 6m +
Engine: Opti 200
Join Date: Jul 2006
Posts: 2
Optimax problem - Low pressure

Hi everybody,

I have an Optimax 200 mod. 11/99. Last summer the engine seemed to work properly. Having full open throttle the max rpm was about 5400 and speed up to 50 mph.
Last week I noticed that even with FOT max rpm was 4700-4800. Besides that problem, the engine is O.K. I checked the engine with a Digital Diagnostic Terminal and no problems were referred. Then I checked the air and fuel pressure. The air pressure was 65 psi and the fuel pressure was 75 psi, well below the acceptable range (80 and 90 psi, respectively).
It is a little bit strange because I have heard that according to the service manual engine will not start if air pressure is below 70 psi.
Several causes were given to me by the Mercury mechanic but nothing for sure. The problem is that among the potential causes fuel pumps and tracker diaphragm were mentioned (quite expensive).
Has anybody experienced a problem like that?



Jimwave is offline   Reply With Quote
Old 09 July 2006, 12:32   #2
Country: UK - England
Town: Hoxne
Boat name: Southern Comfort
Make: NorthCraft 5.5
Length: 5m +
Engine: 150 Optimax
MMSI: 235033276
Join Date: Nov 2005
Posts: 122
Send a message via MSN to Under the Thumb
Opti Problems


Have a look here
it sounds like the same thing you're going through. The first Opti's had a few problems and there were some recalls for injector and fuel rail related issues.


Northern Exposure Rescue

Marine Safety / Photography / Event Management
Under the Thumb is offline   Reply With Quote
Old 09 July 2006, 13:12   #3
Country: Greece
Town: Athens
Make: Wave
Length: 6m +
Engine: Opti 200
Join Date: Jul 2006
Posts: 2
Optimax problem

Thanks Will.

According to my service manual possible causes are, as follows:
- leaks from high pressure air lines
- failure of air compressor reed valves
- faulty air pressure regulator
- faulty tracker diaphragm
Since the fuel pressure is 10 psi over the air pressure I don't think that the problem is from the fuel pumps. Further, I don't think that fuel pressure regulator is damaged.
The problem you mentioned derived from the tracker diaphragm.
I heard that this diapragm goes with the fuel/air rail and costs something like 1500 Euros. So, I hope that my problem is due to air leakage or compressor reeds.
Jimwave is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 02:02.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.