Piston and Connecting rod service pg 207 Flashcards
Give a brief explanation of why cylinder ridge must be removed before pushing the piston and connecting rod from the cylinder.
The piston rings will catch on the ridge, making the piston difficult to remove and possibly damaging the piston and rings.
List two safety precautions when using a rotary wire brush to remove a carbon ridge from a cylinder.
A. Wear eye protection
B. Make sure that the wire brush is suitable for the speed of the tool turning it.
In preparation for piston and connecting rod removal, the piston to be removed should be positioned at: A. TDC. B. 90 Degrees BTDC C. 90 Degrees ATDC D. BDC
D. BDC
Explain why it is necessary to remove the piston cooling nozzles from some engines when removing and installing some piston and connecting rod assemblies.
To prevent damage to the piston cooling nozzle.
When removing and installing piston rings, a ring expander should be used to:
A. Expand the rings to their maximum diameter.
B. Prevent piston and ring damage.
C. Keep the rings in order.
D. Position the ring gaps.
B. Prevent piston and ring damage.
List the parts of the piston that should not be bead blasted.
A.
B.
C.
A. Ring grooves
B. Skirt
C. piston pin
When scraping carbon from the rings grooves of a piston, care must be taken to ensure that:
When scraping carbon from the ring grooves of a piston care must be taken to ensure that metal is not removed from the ring groove area.
What tools should be used to measure the wear in a keystone piston ring groove?
ring groove wear gauge
Pistons should be visually inspected for signs of: A. B. C. D.
A. Cracks in the crown, skirt and piston pin bores.
B. Scuffing and scoring on the skirt, ring lands and crown.
C. Signs of wear or erosion in the ring grooves.
D. Looseness or de-bonding of inserts (for example ring grooves)
The skirt of a piston should be measured at a point midway down the skirt and \_\_\_\_\_\_ to the piston pin bores. A. 30 Deg B. 45 Deg C. 90 Deg D. 180 Deg
C) 90 Degrees
List three problems that will occur with worn piston ring grooves.
A.
B.
C.
A. Blowby
B. Oil consumption
C. Broken Piston rings
Calculate the piston clearance using the following measurements:
Piston Skirt Dia: 4.9985”
Cylinder bore diameter: 5.0017
0.0032”
What would be the result of a piston installed with insufficient clearance between the skirt and the cylinder wall?
Scuffing/scoring and eventual piston seizure.
Piston rings should be measure to determine:
A. Maximum outside diameter and taper.
B. Minimum outside dimension and taper.
C. Maximum outside dimension and out of round.
D. Minimum outside dimension and out of round.
D. Minimum outside dimension and out of round.
Calculate the piston pin clearance using the following measurements:
Piston pin diameter-2.4997”
Piston pin bore diameter-2.5012”
0.0015”