201ka - Cylinder Head Service Flashcards
What should be done before removing rocker arms and camshaft?
Loosen rocker arm adjusting screws
201ka pg. 4
Why should injectors and glow plugs be removed from the cylinder head before removing the head from the block?
They protrude below the bottom of the head and are easily damaged.
201ka pg. 5
What order should cylinder head fasteners be removed?
Opposite of torque sequence used for engine assembly
201ka pg. 6
How should a cylinder head be stored when off the engine?
On a set of wood blocks
201ka pg. 7
Where is a common place for cracks on a cylinder head?
Between valve seats and injector holes
201ka pg. 7
What should cylinder head cap screws be visually inspected for? (4)
- Damaged or missing threads
- Reduced diameter (stretched past elastic limit)
- Corrosion or pitting
- Stretch/Length
201ka pg. 9
What stiffness of wire brush should be used on cylinder head cap screws?
Soft bristle brush/wire wheel
201ka pg. 8
How should valves be stored when removed from the cylinder head?
Stored in order and marked to assist in diagnosis, measurement, and reassembly.
201ka pg. 11
What must be done to the cylinder head in preparation for pressure testing?
Seal all of the cylinder head coolant passages and plug injector tubes using dummy injectors
201ka pg. 12
What maximum pressure range is used when pressure testing a cylinder head?
20-40 psi
201ka pg. 13
When pressure testing a cylinder head, what temperature water is used and for how long is it left in the water?
180 - 200 F (83 - 93 C)
15 - 20 minutes
201ka pg. 13
What four main methods can be used to clean a cylinder head?
- Petroleum solvent
- Hot tank (not aluminum)
- Mechanical parts washer
- High temperature oven
201ka pg. 13
What would white scale indicate in the water jacket?
High concentration of minerals in the water that is mixed with the coolant
201ka pg. 18
What would green/blue deposits indicate if found in the water jacket?
An over-concentration of coolant
201ka pg. 18
What would rust or corrosion indicate in the water jacket?
Insufficient corrosion inhibitors in the cooling system.
201ka pg. 18
What should be done before measuring valve guides to ensure an accurate measurement?
Remove carbon buildup by using a valve guide scraper or brush.
201ka pg. 18
What are two results of worn valve guides?
- Loss of power
- Oil consumption
201ka pg. 19
What are two common valve face angles and what are their benefits?
- 30 degrees - better airflow
- 45 degrees - better seating force
201ka pg. 24
What should be done with valves that have excessive runout?
Replaced. Do not try and straighten them.
201ka pg. 24
After grinding down a valve face, what is the minimum margin thickness?
Not less than 1/2 the margin thickness of a new valve.
201ka pg. 25
What would happen to a valve if operated with insufficient margin thickness?
Will run excessively hot and burn prematurely.
201ka pg. 25
If a cylinder head is machined, where should it be stamped to indicate that it has been machined?
On a non-sealing surface of the cylinder head.
201ka pg. 27
What are two methods of reconditioning integral valve guides?
- Knurling
- Repair sleeve
201ka pg. 28
How can removable valve guides be removed from the cylinder head?
- Ball peen hammer
- Air chisel
- Removal tool
201ka pg. 28
