Diesel

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Once the gear is heated, how is it normally installed?

At the required temperature the gear can be dropped over the shaft and allowed to air-cool

Valve Lash is a gap between the rocker arm and the valve stem. WHY is this required to be at a specific setting?

If they aren't right the valves would stay constantly open

How are timing gears commonly fitted to shafts?

Keys

What are 6 visual inspections that can very easily determine if a cam is bad?

Pitting, scoring, peeling of lobes and scoring, wear, blueing of journals, uneven wear

What is a cam CPS and what is it used for?

a cam position sensor, signal shaft speed and position data to the engine control module

What is a "follower" and /or what is it used for?

a lifter to the pushrod

The camsaft profile actuates which of the following parts?

a. Injection Pumps b. Unit Injectors c. Valvetrains

Timing gear Backlash is important, Its the movement between gears also called play between the gears. How do you check gear backlash?

dial indicator or thickness gauge

What 2 things are timing gears responsible for in a diesel engine(What do they do for the engine)?

driving the camshaft. most of the engine accessories on a diesel-powered truck engine

How does a rocker know when to actuate the component its used to operate?

either push rods or cams

When a timing gear needs to be replaced how do you remove it from a shaft?

hydraulic puller or press

What are the 2 different mounting locations of Camshafts?

in the head or in block

What can happen if you overheat the gear during installation?

overheating a gear will be to destroy the heat treatment and possibly the surface hardening resulting in premature failure

Where are timing gears located on the engine? There are 2 different locations

rear and front mounted

What is the process for repairing any cam defects that you might have found during the inspection process?

should be replaced

What are keepers used for?

split lock fitted to a peripheral groove at the top of a cylinder valve stem. holds the spring retainer in position

What part is used to rotate the valve when the engine is running? And why do valves need to rotate while the engine is running?

the flexibility is required so that at engine can adapt to different operating condition

What is Camshaft Endplay? AND what is the procedure to measure it?

the movement of the cam from front to front to back in the engine. Dial indicator on the front of the cam with the cam installed and move it back and forth

What is the cams OBC?

the portion of a cam profile with the largest radial diameter

What is the BC of a cam?

the smallest radial dimension of an eccentric (base circle)

How do you know if the cam gear and other gears are in the correct postion?

they are index with stamped markings

What are "Pushrods" and where do they fit into the valvetrain?

they are rods that ride on the cam and push on the rockers. they go in-between.

What are "Valve Bridges" used for?

to push on 2 valves at once

What are "Rockers" used for?

to push on the valves opening and closing

How do you measure Cam Lift

using a dial indicator place it on the cam lobe and spin the cam

What should you place the Cam on during inspection?

v blocks

What are valve and injector trains used for?

valve and injector trains transmit the effects of cam geometry to the cylinder valves and injector assemblies

What are valves used for?

valves provide the means of admitting air into, and discharging exhaust out of, the engine cylinders.

How are Valve Springs tested to make sure they are still within spec.? ALSO what is the spec.?

with a tension gauge should be within 10% of the original


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