ME 257 Revision sheet 1 page 1

Question 1

4 Types of crankcase doors?

Answer 1

1.plain access door
2. oil drain door
3. dipstick door
4. explosion door
5. oil filler door

Question 2

state the speed categories of medium and high speed diesel

Answer 2

300-1000 RPM medium speed
1000+ RPM high speed

Question 3

Name the components fitted to a crankcase explosive door.

Answer 3

crankcase, sealing ring, pin, handnut, spring, flame shield and guide, clamp bar

Question 4

The components driven from the engines gear train

Answer 4

main camshaft, 2x fuel Pp, 1x governor, 1x overspeed trip, 2x Lube oil Pp, flywheel, supercharger, FW Pp, TVD, SW Pp

Question 5

Insoluble High Level Report. what your actions

Answer 5

Ships staff to send a report to abbey wood, sample to be sent to Intertek for further testing

Question 6

what kind of lube oil contamination would cause a high level Insoluble

Answer 6

1. carbon
2. gas blow-by
3. particulate matter

Question 7

Name two types of contamination and possible cause

Answer 7

1. fuel dilution - fuel injection equipment
2. water - leaks from coolant or exhaust system
   3.carbon products - ring blow by or light load
   4- oxidation - high temps on a oil metal components

Question 8

good practise techniques of sampling taking to ensure accurate results

Answer 8

1. Take all sample from same position
2. Purge sampling lines
3. Always use clean sample bottles
4. Ensure engine is at working temperature when taking sample

Question 9

Seals fitted to a FW coolant pump

Answer 9

1. Mechanical seal
2. Rubber lip seal

Question 10

the measurement taken upon setting up a newly fitted air start moter, and how to adjust

Answer 10

1. backlash dimension 0.7 - 0.9MM, Remove or add more shims behind the motor support bracket to get the correct backlash.
2. axial clearance 6MM+- 1MM, The motor should be positioned axially in the bracket to give a clearance