Oil routings in cylinder head

[jyrki]

Hi,
my bike is FJ1200, model 88, 3CW, driven about 155 tkm. As I first time opened the cylinder head, I was wondering how oil is flowing to cylinder head and camshafts? There is 3 sleeves available on studs, is it enough/right amount?

Those rubber sleeves in 6 studs looks like rust, I'll clean those studs and paint them with high temperature paint (as other topic in these fj pages suggested).

Motor is consuming more oil than my previous Yamaha (XJ), so would piston rings be likely reason for that and/or valve seats? Should the camshaft chain be changed at the same time.

br Jyrki

[jyrki]

forgot picture

[aviationfred]

The engine is designed for the Cylinder Head Oil Galleys to be through the green rubber grommets that are on the 2 cylinder studs on the OUTBOARD side of the #4 cylinder. Two notes of caution, 1. use brand new green grommets, 2. Once the head is back on. COPPER washers are used on the same cylinder studs under the Cylinder Head Nuts.



Fred

[balky1]

If the money is not your restriction, change everything you've mentioned. It's a decent amount of kilometers to do it. Maybe not necessary, but it will save you a lot of work later. These beasts usually don't use oil, or use it  in very small amounts. I've noticed some oil level decline when I ride at 38 °C ambient temp and more.
If you don't have enough money, change the chain and rings. That way you won't need to remove the cylinders again if the troubles continue. I'm really no expert, but that's how I would do it. Oh, change all gaskets you can, also (head gasket maybe not, but someone should have better advice on this).

[balky1]

The engine is designed for the Cylinder Head Oil Galleys to be through the green rubber grommets that are on the 2 cylinder studs on the OUTBOARD side of the #4 cylinder. Two notes of caution, 1. use brand new green grommets, 2. Once the head is back on. COPPER washers are used on the same cylinder studs under the Cylinder Head Nuts.



Fred

Jyrki, be advised that number 4 cylinder on your picture is the left most. They are counted usually from left to right when you sit on the bike. 

[oldktmdude]

Oh, change all gaskets you can, also (head gasket maybe not, but someone should have better advice on this).

Head gaskets should be replaced every time they are disturbed. This is advice that I was given a long time ago and have always adhered to it. Others may have a different point of view, please advise if this has changed due to modern materials and manufacturing techniques.
   Regards, Pete.

[ribbert]

Oh, change all gaskets you can, also (head gasket maybe not, but someone should have better advice on this).

Head gaskets should be replaced every time they are disturbed. This is advice that I was given a long time ago and have always adhered to it. Others may have a different point of view, please advise if this has changed due to modern materials and manufacturing techniques.
   Regards, Pete.

There is no other point of view - never re use a head gasket (OK, maybe on your lawn mower if the shop's shut)

Noel

[racerrad8]

Jyrki,

Like Fred said, the oil flow up around the two stud at the end of the engine at the farthest left of your photo. The two dowels had a black seals on them that looked like these: Yamaha Dowel Seal

The original ones are black and made of rubber. They had many failures over the years resulting in oil leaks. The then changed over to the green viton rubber seal that you can see  in the link.

Here are the Yamaha Copper Head Washer Fred referred to as well.

Chip all of that baked on rubber off and paint the studs for protection.

Valve stem seals and piston rings will be your source of oil consumption.

Let me know if I can be of assistance.

Randy - RPM

[jyrki]

Many thanks for your valuable advice! restoration continues... "likely" in Finland winter is so long, so I can really concentrate on this very interesting project, and hopefully happy driving my FJ next spring.

[Pat Conlon]

While the head if off, install fresh (Viton) valve stem seals.
http://www.rpmracingca.com/proddetail.asp?prod=Head%3AVSS&cat=39

Might as well get some lapping compound and lap your valves and valve seats.