Cylinder Head And Valvetrain Flashcards
Cylinder head removal should be performed on a completely _________ engine to reduce the chance of ________.
Head bolts should be removed in a sequence exactly _______ of the ______ sequence
Do not sit the head directly on the workbench many Diesel engines have __________ or __________ protruding from them.
Cool Warping - Opposite Installation - Injector tips Glow plugs
When cracks in the head are suspected, ________ or ________ detection equipment may be required to highlight them.
Visually inspect the head for cracks in the _______,scale build up in the __________, and pitting of ______ .
Obstructions lodged in holes such as metal liquids can cause a bolt to bottom and _______ without obtaining the required ___________.
Magnetic Dye \_\_ Casting Coolant passages Machined surfaces \_\_\_ Torque value Clamping force
The cylinder head should be checked for _____ using a _____ and ______, measure for ______.
Check cylinder head thickness called _______ thickness to determine the maximum allowable machining thickness.
Cylinder head thickness should be measured if a tech suspects the head has been __________.
Warping Straightedge Feeler gauge Flatness _ Deck to deck _ Machined
Check for war page at each end and between each _________ between center lines of ______, and the outer edge of the ________.
If properly reassembled a machined cylinder head allows ________ tips __________, and ________ to move deeper into the cylinder.
This can increase ______,______ of injector spray pattern and contact with _______. In OHC engines ________ operation can be affected
Cylinder Valves Fire deck _ Injectors Glow plugs Valves _ Compression Misalignment Piston Cam
Check valve spring straightness using a _____. This will prevent stems from ________ and _______ in guides.
Replace valve springs that don’t meet tension specs to prevent damage to the _________ or __________.
Valve springs that use the same valve bridge must be replaced together to prevent __________ operation.
Square Binding Twisting _ Piston Crankshaft _ Unbalanced
Valve ________ rotate the valve every time it’s actuated.
Valve _______ keep the spring on the valve.
If valve _______ fail the valve drop into the cylinder and jams the piston this is called ________ .
_______ between the valve guide and valve _________ prevents oil from entering the cylinder.
Rotators - Retainers Dropping a valve - Seals Stem
Defective seals can cause excessive ________ leading to engine________ .
Injector sleeves are inspected __________ for damage.
Check the injector tip protrusion using a ___________ and ________ failure to meet specs will result in improper _____________ .
Oil consumption Smoke - Visually - Dial indicator Sled gauge - Spray pattern
Valve bridges ( cross heads) are used on engines with _______ or ________ valves per cylinder.
The crosshead is a bracket or bridge like device that allows a single rocker arm to open________ valves at the same time
If the bridge is adjustable the adjustment is made when the valves are _________ ( closed). The purpose is to ensure that both valves are opening _________ to prevent ________ of the bridge on the guide .
Three Four - Two - Loose Equally Binding
___________ bridges are not adjustable.
___________ are components that are positioned to ride on the camshaft and transfer motion to the pushrod or ________.
When cam followers are mounted on a plate bolted to the side of the engine it may be necessary to adjust there placement by gaskets of different ________ .
Guide less - Cam followers Rocker arms - Thickness
When valves are properly adjusted there should be appropriate clearance between the ________ and the top of the ________.
________ is required to ensure the the valves seat completely in the cylinder head.
Exhaust valves operate at _______ temps and are usually adjusted to a ________ spec.
Rocker arm Valve stem - Valve lash - Higher Wider
Valves are adjusted _______. Set all valves In firing order sequence.
Injector adjustments on some engines will involve tightening the injector to a specified _________ and tightening the ________.
Other models the adjusting screw will be tightened until the injector ___________ is bottomed the backed off a specified number of _________.
Closed - Torque Locknut - Plunger Degrees
