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22 Cards in this Set
- Front
- Back
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What are the different types of distance pieces? |
-single compartment -double compartment |
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When would you use a long single compartment distance piece? |
In non-lubricated cylinders, the extra distance that the oil must travel along the rod with the oil baffle makes it very unlikely that oil could ever reach the cylinder and contaminate the air supply |
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When is a two compartment distance piece used? |
And applications where a complete seiling of an explosive gas in the compression chamber must exist |
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What are the final adjustments to balance the reciprocating weight? |
Balance nuts |
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What is the purpose of the cross head |
To center the piston rod in the packing case (to allow the packing to seal the compression from the piston on the return stroke) |
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What is a floating pin crosshead? |
The crosshead pin is able to float in both the connecting rod bushing and the crosshead bushing. The pin is not attached to either piece and is free to turn in either bore |
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What is an adjustable crosshead |
Manufacturers equip adjustable crossheads with removable shoes that allow for faster and less expensive overhaul. -another advantage is that manufactures can shim the shoes at the bolt locations in order to alter the clearance between the cross head and guide |
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How do you check the clearances on a crosshead? |
-Insert a 0.0015" feeler under the crosshead. If it does not go in anywhere the crosshead is sitting tight to the guide -clearances at the top should be even all over and generally somewhere between 0.007 and 0.010 |
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What factors concerning the crosshead can cause rod run out? |
-you shimmed the crossheads improperly -The crossheads are worn out -the piston rod lock nuts are not seating squarely against the crosshead face |
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Connecting rod: The large end rotates with the _________ and adds to _________ vibration while the small and slides back and-forth with the _______ and adds to the _________ vibration |
Connecting rod: The large end rotates with the crankshaft and adds to rotational vibration while the small and slides back and-forth with the piston and adds to the reciprocating vibration |
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What are the three most common types of connecting rods |
-Straight cut -bias cut -articulating or king type |
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What would you see a bias cut connecting rod? |
You use them when you must pull the connecting rod out for the cylinder bore |
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When would you see an articulating connecting rod? |
And allows you to mount two pistons on one crankshaft journal in order to help reduce the size of the compressor |
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What is different about a V type compressor? |
-The V-type compressor allows for two connecting rod journals to be mounted side-by-side. -it is subject to greater bending and twisting stress because the journal must be longer |
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Can connecting rod caps be switched? |
No they are created as a one piece component, therefore you must keep the mates together and in the correct alignment |
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Why would you use a tongue and groove joint or a serrated joint on a bias cut connecting rod |
The design of the bias cut places shear stress on the rod bolts |
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What is the easiest way to do a nondestructive test |
Liquid penetrant checks for cracks |
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What's the easiest way to check if the connecting rod is straight |
Lay it on a precision ground surface and check it lays flat |
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What is a bump check and what is it used for? |
A bump check is a common method to determine whether a bearing is worn enough to warrant further dismantling you can also use it to check new installations for any error in assembly |
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The function of a connecting rod is to convert rotating motion to reciprocating motion. True or false |
True |
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Connecting rods are symmetrical and thus are impossible to install incorrectly. True or false |
False, the fit is not identical |
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Card # 22 |
Finished |
