Topic: Oil flow diagram

[Patrick]

So I finally got my k) 750 back together. It started right up. Ther only issue now is that oil if GUSHING from the oil filter housing. I will change the filter and oring, again, but I fear there may be a blockage forcing the oil out the filter housing instead of letting it flow. Where does the oil go from the filter? Where can I see a diagram and find out where I might have an issue? I do not believe it is in the top end. That went together very well.

Patrick

[mystic_1]

On the right side of the engine above the points cover is a small round cap with a hex head molded into it.  This is the end of the main oil gallery, which traverses the engine from side to side, right behind the cylinders.  If you follow the hump in the casing the the middle, just below the cam chain tensioner, you find the oil pressure switch.  Either of these points make a convenient placeto verify oil flow, but don't try to run the bike without them or you'll have much cleaning to do.    Just pull either one and see of there's oil.  The right side cap is most convenient.

This, btw, is where most oil pressure gauges connect, you drill the cap and tap it for a fitting.

cheers
mystic_1

[Patrick]

Thanks, Mystic. I actually have a pressure gauge in the oil galley. But with the spreading flood of really expensive oil engulfing my garage, I didn't think to look at it.

The moral of this story is that there are only so many times you can reuse the o-rings around the oil filter housing. I was one fill over the line.

New o-rings and Honda filter. It's fine now - assuming this rebuild finally solved that persistent top end oil leak I was trying to fix. There's nothing dripping off the fins as it idles in the garage, but I won't know for sure until I tuned it back up and take it for a ride.

I live in hope.

Patrick

[Bob Wessner]

Patrick, check your eMail. I tried to upload a PDF that covers this, but it was too large a file.

[Patrick]

That is exactly what I was looking for, Bob. Thanks.

Patrick

[mystic_1]

Dug this up:

[corkman]

Hi Mystic_1,
  Thanks for the info. I have a couple of questions though:
1. In your statement: "oil travels upwards from the main oil gallery via the two center rear cylinder studs, all the way up to the head". Does the oil enter the head (valve area) via the orifices, the cylinder studs, or both?

2. I have what looks like 4 orifices. The two in the middle have holes in them but the two outer ones do not have holes in them. Is this normal? There are 4 holes in the part that mounts over the orifices as if something is suppose to flow from the orifice to the rocker arms/cam holder above all 4 orifices, but only 2 have holes that would allow oil to flow. Is this correct (only 2 have holes) or not?

Thanks,
Bill

[mystic_1]

Hi Mystic_1,
  Thanks for the info. I have a couple of questions though:
1. In your statement: "oil travels upwards from the main oil gallery via the two center rear cylinder studs, all the way up to the head". Does the oil enter the head (valve area) via the orifices, the cylinder studs, or both?

2. I have what looks like 4 orifices. The two in the middle have holes in them but the two outer ones do not have holes in them. Is this normal? There are 4 holes in the part that mounts over the orifices as if something is suppose to flow from the orifice to the rocker arms/cam holder above all 4 orifices, but only 2 have holes that would allow oil to flow. Is this correct (only 2 have holes) or not?

Thanks,
Bill

1. Both:  Oil travels up through the passages that the studs sit in.  They then pass sideways through a small drilled hole to the oil orifice.  From there the oil passes upwards into the cam holder.  The cam holder has interior passages that direct the oil to the bearings and squirt onto the cam lobes.

2. There are only two orifices, on the "inside" ends of the cam holders.  If you look closely at the diagram, pressurized feed oil path ends at the outer ends of the cam holders.

mystic_1