Question Worksheet #10 Pistons, Connecting Rods, and Rings

Name:____________                                                                  Transportation Systems

Date:_____________                                                                 Mr. Wood

Question Worksheet #10 Pistons, Connecting Rods, and Rings

1. The two metals from which pistons are most often made are ____________ and ________________.
2. The ridges between the ring and grooves are called _____________________
3. Explain the function of the oil control ring.__________________________________________________________________________________________________________________________________________
4. Draw the cross section of a piston below and identify its parts.

A._____________________

B._____________________

C._____________________

D._____________________

E._____________________

F._____________________

G._____________________

H._____________________

I.______________________

1. The _________ is the lightest part of the piston.
2. The section of the piston surrounding the piston pin hole is called the ___________ ____________.
3. The two main reasons for a specific piston to cylinder clearance is to accommodate ______ _______ and _____________.
4. When can ground pistons heat up. They expand
   1. Perpendicular to the piston pin
   2. Parallel to the piston pin
   3. Equally perpendicular and parallel to the piston pin
   4. A lesser amount
5. Thrust surfaces on a piston are at _________ _________ to the centerline of the crankshaft and piston pin.
6. Why is the piston made smaller at the head than at the skirt? ______________________________________________________________________________________________________________________________________________
7. Draw four common shapes of piston heads on the pistons.

1. Piston rings are separated from the cylinder wall by a thin film of _________.
2. Compression piston rings from a seal by fitting closely to the cylinder wall and the ring ______________.
3. The sides of a ring groove must have what three characteristics?________________________________________________________________________________________________________________________________________________________________________________________________________

1. The piston ring must have proper side ___________ in the groove.

1. Piston rings may be made of ________ __________ or _______________.

1. Compression rings are usually made of __________________.

1. Why are compression rings designed to twist slightly in the ring grooves?____________________________________________________________

1. Explain why some two-cycle engines have piston rings pinned so they cannot revolve around the ring groove. ______________________________________________________________________________________________________________________________________________

1. Ring side clearance can be checked with a tool called a(n)___________________.
2. Piston rings are installed on a piston with a tool called a ring _____________________.
3. The oil control ring is located at the __________of a piston.
   1. Top      b.    Bottom      c.   Middle        d.   Middle and bottom

1. A general rule for ring end gap is to allow _________for every inch of cylinder diameter.
2. Piston rings installed with too little end gap will result in broken rings and scored __________ ______________

1. Too much end gap will result in _______________.

1. Ring end gap is measured by placing the rings in the cylinder and using a tool called a(n) ________________ ______________

1. If the ring end gap is too small, the ring ends can be carefully _________ until the proper gap is obtained.

1. When installing a piston with the ring in a cylinder, a tool called a(n) ____________ _______must be used to overcome ring tension.

1. When rings are placed on a piston prior to installing them in a cylinder, the ring gaps should be ________ to obtain the maximum compression.

1. The __________attaches the piston to the crankshaft.
2. ___________are used at both ends of the connecting rod, the proper procedure is to press them into place by exerting pressure at the ___________of the insert.
3. Precision insert bearings are prevented from turning the rod by use of bearing _________.
4. When installing precision insert bearings in a connecting rod, the proper procedure is to press them into place by exerting pressure at the ______ of the insert.
5. When insert bearings are manufactured, they are made to a slightly larger curve than the rod bore so that they will seat tightly. This is called bearing _______________.
6. When precision inserts are carefully pressed into the rod bore, the ends will protrude slightly above the parting surface. This is called bearing __________________.
7. Bearing inserts are made in ____________pairs.