ENGINE COMPONENT AND LOCATION 77
Camshaft and Valve Train
W2033300
1. Inlet Valve Yoke (Bridge)
5. Volvo Engine Brake Rocker Arm
2. Inlet Valve Rocker Arm
6. Exhaust Valve Yoke (Bridge)
3. Injector Rocker Arm
7. Shim Retaining Screw
4. Exhaust Valve Rocker Arm
The engine has an overhead camshaft and rocker arm shaft in support of four valves
per cylinder. The camshaft rides on seven journals with a bearing cap and support
block (saddle) at each point. The bearing inserts (shells), bearing caps and support
blocks are replaceable.
In standard configuration (with VGT exhaust brake only), there are three cams for
each cylinder, including inlet, injection and exhaust. There are four cams per cylinder
in the optional configuration (VGT exhaust brake plus Volvo Engine Brake) with the
addition of a "brake" cam at each cylinder.
The rocker arms are positioned on the shaft (front to back) in the order of inlet, injector,
exhaust and brake, if so equipped. Both the inlet and exhaust rocker arms each drive
the valve pairs via a pinless yoke (bridge). On engines equipped with Volvo Engine
Brake, the "brake" rocker arm works in combination with the exhaust rocker arm to
precisely control the opening and closing of the exhaust valves for engine braking.
Exhaust valve yokes include a shim for adjustment. Replaceable valve guides and
seats are made of alloyed cast iron and steel respectively. All valve guides have oil
seals. Exhaust valves have double valve springs.
Summary of Contents for EPA2007 D13F
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Page 35: ...SPECIFICATIONS 29 Bearing Cap Camshaft Rocker Arm Shaft T2022796 ...
Page 101: ...ENGINE COMPONENT AND LOCATION 95 Fuel System W2033327 ...
Page 134: ...128 ENGINE COMPONENT AND LOCATION Rear Engine Components W2032470 ...
Page 136: ...130 ENGINE COMPONENT AND LOCATION Oil Pan and Stiffing Frame W2032451 ...
Page 138: ...132 ENGINE COMPONENT AND LOCATION Lower Engine Components W2032471 ...
Page 140: ...134 ENGINE COMPONENT AND LOCATION Replacement Kits Engine Replacement Kits W2032452 ...