Setting Diesel Engine Valves Using The Rocker Method

Setting Engine Valves

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Setting engine valves is the same for every diesel engine made if you use a certain method. If you rotate the engine to a particular spot lining a pointer or engaging a timing pin, that’s diesel mechanic information documented by each individual manufacturer.

You rotate the engine over to TDC (top dead center) and adjust 1/2 the valves then rotate 360 degrees and adjust the other half. The DT 466 E engine for example has the same valve clearances when the engine is both hot or cold.

Would If You Don’t Have A Manual?

There’s a universal valve setting method that I use which can be implemented on every diesel engine made. It’s called the rocker method which eliminates the need for a service manual when the time comes to carry out this operation.

However you do need to know the intake and exhaust valve clearances commonly found on the decal attached to the block.

Here’s How It Works

While rolling over the engine watch the valves open and close. On a 6 cylinder model #1 and #6 cylinders rise and fall together from TDC (top dead center) to BDC (bottom dead center). The same goes for #2 and #5 as well as #3 and #4 cylinders.

Think of these 3 sets as sister cylinders. Every time a piston reaches TDC the stroke will either be compression stroke or and exhaust stroke.

Follow The Firing Order

The firing order on an in-line 6 cylinder engine is 1-5-3-6-2-4 I always start at #1 cylinder. While facing the engine rotate it clockwise and watch #6 cylinder for the exhaust valve closing

When the exhaust valve closes the intake will just start to open(this is why it’s called the rocker method). As soon as you see the intake valve moving STOP turning the engine and adjust the Intake and Exhaust valves on #1 cylinder. #1 is now on compression stroke (both valves closed/ rockers loose) while #6 cylinder is on the exhaust stroke.

Repeat With The Next Cylinder In The Firing Order

The next cylinder in the firing order is #5. Rotate engine until #2 cylinder is on the intake /exhaust valve overlap then adjust #5 valves. The same goes for #3 cylinder (next on the firing order) #4 valves go through the overlap process and so on through #6-#2-#4 cylinder valves.

This is diesel mechanic information you can use all the time if you have an in-line diesel engine that needs a valve set and you know the valve clearances.

Post time: 03-10-2018