OX66 oil pump linkage adjustment

[rangr02]

Hello all, thanks for a great site!

I have been busy updating the maintenance on my 99 250 ox66 which I have no previous records for. Researching this topic has revealed a lot of good info, but I am still not sure what the real answer is for my particular engine when it comes to setting the linkage gap. My factory manual clearly states no clearance with the throttle valves closed. I have no updates to this manual. The SELOC manual wants .040 clearance with the throttle valves closed, and I have found this same reference to .040 several times on different bbs concerning this engine. Of course, to get zero clearance on my engine, I will have to shorten the rod - its bottomed out right now at .040 and it has to make me wonder why yamaha would intentionally send it out this way. Not to mention why a service tech hasnt shortened it by now...

By the way, I've had this engine for a while now and I have to thank all members, especially Rodbolt for thier help in getting the maintenance up to speed. I cant tell you how many times I've refered to this site while going through the long list of tests and procedures this engine requires. I still have wet plugs that I suspect is due to the O2 sensor being permanently fouled. I've cleaned it twice now. It tests out at .7 volts regardless if the number one throttle valve hole is plugged or not. I've got a new one and will install it when I am sure the oil linkage is properly adjusted. No use in fouling a $220.00 sensor.

By the way, all 3 fuel pumps are new. I found one bad one and decided the other two cant be far behind. Still wet plugs, and it still smokes on start. I know thermostats may be the culprit, they are next on the list after the O2 sensor. After all, she runs pretty good the way it is, and I gotta go fishing...Any suggestions?

Thanks,
Frank

 

[rodbolt]

Re: OX66 oil pump linkage adjustment

unclip the lower two throttle shutters so the bottom shutter can fully close. the spec is .005-.04.
I shoot for .005-.010" and most the time have to clip 3-4 threads from the rod.
I dont suggest bending the rod as this may change the radius that it moves in and create other problems.

have you checked the spark plug caps for proper resistance?
does the idle speed slow from 1200 or so to 650 or so after it warms up ?

 

[rangr02]

Re: OX66 oil pump linkage adjustment

Thanks, Rodbolt. I figured you would know. I am still curious, where is this published? In all of my searching the net and yamaha mechs around here, I never found anything other than fully closed or .040. Was this in a tech bulletin not available to us low life end users?

All spark plug caps checked out at about 5kohm and I forgot to mention the winky blinky showed no codes.

The idle speed is always at about 700 rpm, its pretty warm down here in the keys. I've yet to start this engine and see anything other than 700 right away. Thermostats and PRV are on my list, though.

Thanks again, I'll post results.

 

[rodbolt]

Re: OX66 oil pump linkage adjustment

test the thernosensor. you should see a fast idle until about 113 degrees, however if the O2 sensor is faulty it may do funny things.
in any case you will always see a slighlty faster idle just after start up due to the ign/fuel characteristics at engine start.
next time ya winky blinky it cold look for a code 33 that changes to a code one after cranking. code 33 means the engine is warming up and should change to a code 1 when the thermosensor resistance hits the 113 degree value.

 

[rangr02]

Re: OX66 oil pump linkage adjustment

Rodbolt,

I have found a loose plastic link on the oil control rod where it attaches to the shaft coming out of the power head. I've got another one coming and will reset the clearance since there is quite a bit of slop.

I'm still trying to get a one piece gasket for the O2 sensor holder. The new gasket is a two piece set that will not fit my original holder and I'm being told the older one piece gasket is no longer made. Its not so much the gasket I need, but the o-ring and seal that is needed to seal the holder to the power head. I've got the newer holder on order to see if it will fit my original power head. Once the O2 sensor problem is sorted out, I will winky blinky it again cold as you have suggested. I have never seen the fast idle you describe on start up, but I suspect my bad O2 sensor is to blame.

If I can figure out how to post pictures, I'll send the pictures I emailed the parts house concerning the wrong O2 gasket set.

Thanks again for your help, Rodbolt.

 

[rangr02]

Re: OX66 oil pump linkage adjustment

OK, here comes pictures.

The original holder, "joint", and gasket is on the left. The new superseded gasket is on the right. Notice the smaller hole in the new gasket where the "nose"( the part of the holder that protrudes into the power head when bolted up, just to the left of the black "joint") of the holder has to pass through. Wont work. The parts house is working on this, but I am being told the older one piece gasket is no longer made. More important is an o-ring and seal inside the "nose" (o-ring and seal are not seen in the pictures) that are worn and need to be replaced. Of course, these are no longer available either.

A new holder is on the way and I'll find out if it fits my original power head.

 

[rangr02]

Re: OX66 oil pump linkage adjustment

deleted, repeat post

 

[rodbolt]

Re: OX66 oil pump linkage adjustment

the original onepiece gasket has been superceded to the two piece gasket, in 03 the 3.1 L motors went to a new style O2 sensor holder and all the blocks had different mounts for the holder, all replacement blocks were shipped with a new O2 sensor holder.
there is a tech bulliten out about it.
look for bulliten 02002-007.
so its possible your block was replaced and now requires the two gasket and one oring setup.
the tech bulliten has a nice description and pictures.
the original seal kit was 68F-W1135-00-00, the new style block uses 69L-11357-00-00,0ring 93210-17003-00 and gasket 69L-11397-00-00.
if you have the hew style block you MUST use the new style O2 sensor holder. the old syle block was machined flat and the new style has a machined [pocket and the new holder has a protrusion that fits into the block.
the two holders ARE NOT interchangable.
all the above parts are readily avalible.
the oringed set up was introduced in the mid 2003 model run.

 

[rangr02]

Re: OX66 oil pump linkage adjustment

Sorry about the repeat posts WITHOUT pictures, having trouble reducing file sizes enough to send.

I'd rather be fishing....

Rodbolt, my power head is original but the parts house I've been using doesnt list the old one piece gasket any more. Time to look at another vendor. Thanks for the tech bulletin info, I'll run those down too.

 

[rangr02]

Re: OX66 oil pump linkage adjustment

Another shot at pictures. Even though Rodbolt already answered the question, I cant stand having a computer kick my butt...

 

[rangr02]

Re: OX66 oil pump linkage adjustment

 

[rangr02]

Re: OX66 oil pump linkage adjustment

Finally got it to work, looks like photo bucket is the way to go.

Here is another view in a smaller format.

Thanks all for your patience.

 

[rangr02]

Re: OX66 oil pump linkage adjustment

Rodbolt,


Mystery solved. Thanks to your post, I started looking at part numbers again and found what I was looking for on 2003 year model parts. Evidently my 1999 engine has the updated block, because the gasket/o-ring/seal combination I need was found under the 2003 parts list. Now I wonder if that bad O2 sensor is the original or replaced with the newer block?

Thanks, sometimes the answer doesnt come easy. I never suspected this engine was anything but original.

Where can I find tech bulletins? My search of the forums and the web came up with nothing.

 

[rodbolt]

Re: OX66 oil pump linkage adjustment

the gasket kit on the right fits pre mid year 03 3.1L motors, the one on the left fits post midyear 03 3.1L motors but requires an oring and another gasket for completeing the job.
on the tech bullitens I am not aware of any online site that has them, I have the marine tech guides since the late 90's.
if it was a warrenty job then most likly the O2 sensor was new as well as the oil pump. a yamaha dealer can punch in your primary ID and tell what was done and when if it was warrenty.

 

[rangr02]

Re: OX66 oil pump linkage adjustment

Its a miracle!

Well, almost. Just finished putting in the new gasket, o ring and seal for the O2 sensor. Nice to have the right parts, thanks to Rodbolt.

Rodbolt, if you read this, what is the correct part number for the plastic arm that is pinned to the shaft coming out of the block that links to the oil pump control rod? It is not 6r5-41237-00 as I thought from the parts diagram. Thats just the plastic keeper for the oil pump control rod. I need the plastic arm that is cross pinned to the metal shaft in the side of the block. Its got an awful lot of slop that makes it tough to set the proper clearance on the other end of the rod.

Thanks again for all of your help, I was getting to think I'd never go fishing again...

 

[rodbolt]

Re: OX66 oil pump linkage adjustment

not sure what your describing, is it the link pinned to the lower throttle shaft? the clip that attaches the rod to the throttle link or the clip that snaps over the ball on the pump arm ?
if the clip on the pump arm is white keep a careful eye on it, they tend to crack then split with age.
you can usually see the crack forming paralell with the threads on the rod.

 

[rangr02]

Re: OX66 oil pump linkage adjustment

Yes, the link pinned to the lower throttle shaft. Thats where all of the slop is coming from. I havent been able to find a part number for it yet. If its not available, I'll work with the one I've got, but it seems to me that it should fit tight on the throttle shaft.

I've been following your answers to another OX66 post on replacing oil pump o rings and seals. My engine smokes quite a bit at idle, also. Especially when its warm from trolling (rpms about 1700- running on 4 cylinders) and brought right back to idle while landing a fish. Then it will smoke enough to kill mosquitoes on the coast 10 miles away. Hopefully its just the slop caused by the link I'm trying to find.

Thanks

 

[Suncoug]

Re: OX66 oil pump linkage adjustment

"a loose plastic link on the oil control rod where it attaches to the shaft coming out of the power head"

rangr02, Do you mean the white plastic peace that is connected to the oil pump or the other end?

I have an oil pump on order and will replace it as well as the white plastic piece to get it real tight like the other motor that I have.

I really hope that replacing the oil pump will fix the rough idle/smoking issue, but I am far from certain that it will do that. I have looked all over the Internet and have found at least a few cases of OX66s having excessive smoke and the owners not being able to fix it. I have considered taking it to the dealer around here, but I don't have much confidence that they will be able to fix it.

 

[rangr02]

Re: OX66 oil pump linkage adjustment

Suncouq,

The loose link is the one pinned to the lower throttle shaft, opposite of the end connected to the oil pump itself.I still havent found a good part number for it, but will post when I find it.

The white plastic piece you refer to is fine on my engine, but I'm changing it out anyway. Its known to crack and its cheap to replace.

Why are you replacing the oil pump? I hope you have checked the O2 sensor, it sure made a difference on mine.

Good luck, post your results.

 

[Suncoug]

Re: OX66 oil pump linkage adjustment

I swapped out the O2 sensor and it helped with other issues but the motor continues to eat a lot of oil and smoke excessively. I checked the o-ring and it doesn't look like there is any oil leak internally. Even when the oil pump is ajusted correctly, it still sucks in 2X the oil. So, I am swapping out as many relavent oil components as practical to see if it will fix it.

I just got the part so I will probably do it this weekend. The Hatteras tuna season coming soon and I would like to get this fixed ASAP. I will keep you posted.