Auto Blend Removal

[Raghauler]

I've worked on small motors for years, but I'm new to large OB's. I've done some searches, learned a lot, but just want to clear up on a couple things regarding removal of my Auto Blend. I know enough about it's lack of reliability that it has to go.<br /><br />Engine: 1987 115 inline S/N OB165923<br /><br />I understand I just need to run the fuel line (w/50:1 premix) directly to OB and toss the Auto Blend. My questions are:<br /><br />What do I do with the wiring harness coming off the Auto Blend going to the engine? It contains three wires: Black = ground; Brown = ? - it runs to the top of the engine block - ; and lavender = ? runs to electronic controls.<br /><br />If I simply unplug the harness from Auto Blend and leave the it in place, will the engine run OK? Will low oil alarm sound? Will I still have an overheat alarm?<br /><br />Thanks in advance.

 

[Mike Caspari]

Re: Auto Blend Removal

Bypassed the oil stuff on my 91 135's, I looped the oil lines from the pump output back to the input, this kept the alarm happy for a while but they would come in and out just enough to be aggitating. I need to get the conversion kit that replaces the pump. Anyways, I unhooked that purple looking leed from the wiring harness and the alarm stopped and no indication from the ignition switch when you first turned the key on(it would beep a couple of times at first juice). Motors run fine and the temp horn still works. I cranked the motor up and simply grounded out the leed from the overheet sensor and got the steady tone from the alarm horn.

 

[ColdFire]

Re: Auto Blend Removal

I've got he same motor just remove the auto blend then tape up the connector and don't worry about it. You can test your high temp warning by shorting the tempsensor lead to gnd.

 

[AMD Rules]

Re: Auto Blend Removal

When I removed my autoblend, I disconnected the wires completely at the motor. The loose purple quick connect from the control harness was taped up for protection and left disconnected. From what I can see, the oil alarm module is part of the autolube assembly. Temperature alarm is independant, and still functions fine. Can be tested by grounding as suggested earlier.<br /><br />Note: Mike's note above sounds like he is referring to the newer on-board oil injection integral to the motor, rather than the original boat-mounted autolube injection systems.