Hi! My name is Larry! Thanks for allowing me to join you Guys, (and Gals) I recently bought a White Forklift with an industrial slant six. It's a great forklift but, as many were, it has been abused over the years. I'm replacing the head and Valve train because it appears it hasn't had any oil up there in a while! My question is how is the valve train lubed? I assume through the rocker shaft. I googled the oil system but couldn't find a diagram. So other than changing out the oil pump as well as the head and valve train what do I need to look out for on this engine? Thanks in advance for the help!

Look at the "articles" section on the main page of this site. I believe that oiling diagram should be somewhere in there. The oil comes up from the oil galley through the rear cam bearing and then up through the back rocker stand. If you pull the rocker assy, you can start by fishing a long rod or drill bit down through the hole and see if it is blocked.

That'll get you started at least...

Welcome to the forum!

Lou

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Home of Slant6-powered fun machines since 1988

How much detail do you want? The rocker shaft is fed at the rear-most stand. Oil is metered into the block passage from the rear-most cam journal.

From the beginning: The oil pump draws oil from the pickup tube, the pump discharge passes the oil by the relief valve on the way to the oil filter. After the oil filter the oil enters the main oil galley which runs the length of the engine on the oil pump/distributor side of the engine. Drilled passages in the block allow oil to pass from the main galley, behind the cam bearings on the way to the main bearings. The cam bearings have small holes for their own lubrication needs. The rear-most cam bearing has two holes. The regular one at the bottom llike the other cam bearings and one at the top. The rear cam journal is drilled to pass oil from the bottom of the cam bearing to the passage above the cam which feeds the head. As stated above the rocker shaft is fed at the rear-most rocker stand. The rocker shaft fills with oil which passes through the rocker arms to the pushrods and valve stems.

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Joshua

What those two didn't mention is that the rearmost rocker shaft bolt is hollow. Pay attention to that during teardown and re-assembly. It might be something to look at. If that engine's been worked on before, somebody could have stuck in an incorrect bolt.

Roger

Negative, the oil goes around the outside of the bolt.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Yes, there is a drilled passage up to the rear rocker arm mounting tower, then the oil passes around the bolt (longer) and into the shaft.
Removing the rocker arm assembly and the lower rear head bolt will allow you to push a stiff wire through and clean-out the passages, all the way down to the cam bearing.
Many time the rocker shaft is not installed correctly and that will prevent oil from coming out of each rocker arm.
On high mile, slugged-up engines, the rocker arms themselves get plugged so check the passages with a shot of carb. cleaner.
DD

DOOHH! They're right. Don't get old......your memory starts to slip and body parts start failing.

Roger