Engines - Frames, Blocks, and Cylinders Flashcards
True or false:
Engine cylinders may be cast into the block or may be removable.
true
This engine component maintains all moving parts in proper relative position to each other and encloses the crankshaft and camshaft.
the engine block
What is the most common type of engine block?
the one-piece block
What is another name for a one-piece engine block?
en-block
How are the bearing caps arranged on a one-piece engine block?
underslung;
the bearing caps are under the crankshaft
What does it mean when an engine has an underslung crankshaft?
the main bearings caps are under the crankshaft;
the crankshaft is bolted to the bottom the engine block
*seen in en-block engines
What is the main advantage of a one-piece engine block when compared to a multi-piece?
rigidity;
the one piece is much more rigid
True or false:
A one-piece engine block is most often used in medium- and high-speed engines.
true
What type of engine speeds are usually found with en-block engines?
medium and high speed engines
True or false:
Multi-piece engine blocks are common in the larger low- and medium-speed engines with bores that are approximately 10” and larger.
true
What type of engine speeds are usually found with multi-piece engine blocks?
low and medium speed engines
How are the main bearing caps arranged in multi-piece engine blocks?
overslung;
the bearing caps are on top of the crankshaft
What does it mean when an engine has an overslung crankshaft?
the bearing caps are on top of the crankshaft
In an en-block engine, what does the crankshaft bolt to?
the engine block
In a multi-piece engine block, what does the crankshaft bolt to?
to the engine bedplate
What are the two pieces of a two-piece engine block and what is their purpose?
- bedplate ⟶ holds the crankshaft
- block ⟶ houses the cylinders
What are the three pieces of a three-piece engine block and what is their purpose?
- bed ⟶ holds the crankshaft
- block ⟶ location to bolt the cylinders to
- cylinders ⟶ self-explanatory
What are the two types of multi-piece engine blocks?
- two-piece blocks
- three-piece blocks
Why are the beds of three-piece engine blocks ribbed?
to form a very rigid structure
Why is the installation and mounting of the bed plate to the foundation critical with three-piece engine blocks?
if not true, the bedplate can become distorted, which will distort the crankshaft line bore;
this determine how straight the crankshaft lies in the engine, which determines bearing and crankshaft life
This type of three-piece engine inspection door has a large, spring loaded relief valve that can pop open in the event of an explosion in the crankcase, preventing damage to the block.
explosion proof inspection doors
What two tools are used to check for flatness of a cylinder block deck on an engine?
- straight edge
- feeler gauges
When pressurizing an engine block to check for coolant leaks, what is the maximum pressure that should be used?
45 psi;
anything higher could create new leak paths
During an engine inspection, the bottom liner bore where the O-ring of the liner seal sits appears to have some pitting caused by cavitation. What are two ways to repair this?
- an epoxy followed by smoothing it out once hard (minor damage)
- machined and re-sleeved (major damage)