The RPM displayed by the tachometer on the dash refers to engine RPM, i.e. the crankshaft.
Two stroke engines have one power/exhaust stroke and one intake/compression stroke per revolution per cylinder. A One cylinder engine at 900rpm produces 15 power strokes per second.
One of the ways of starting a diesel engine is turning the key to stat position without turning the engine on. The second step is to wait for the glow plugs to heat up.
An intake air duct serves as a passage for supplying air to an engine, and includes a first intake air passage, a second intake air passage, an opening-and-closing valve, an interlocking member and a coiled spring. The opening-and-closing valve is disposed swingably in the second intake air passage so as to open and close the second intake air passage
50 times per second on a 4 cycle engine.
Your 4 strokes are Intake, Compression, Power, and Exhaust. On the first revolution is Intake on the down stroke, then compression on the up stroke, the next revolution is power on the down stroke and exhaust on the up stroke, so 2 revolutions complete a full cycle. That would mean 450 power strokes occur per minute, divide that by 60 to get 7.5 power strokes per second
The 3.1 engine has a crankshaft sensor behind the crankshaft pulley. Remove right front tire and inner splash panel for access. There is a second sensor on the back side (firewall side) of the engine above the oil pan on the block- near the center. Difficult to each. Bad news if you break this sensor since it can be brittle and difficult to extract if it breaks.
450 power strokes per-minute 450/60=7.5 power stokes per second
Top dead center (TDC) is when the number 1 piston is at the very top of it's stroke on it's power (firing) stroke. This holds true for ALL internal combustion piston engines. If you remove the driver side valve cover, the second valve from the front is the intake valve on a small block Chevy, including the 305. Slowly rotate the engine by hand. When the intake valve closes, keep turning the engine until the timing mark lines up at zero. When it does, you are at top dead center.
its the second wired plug towards the engine on the air intake pipe
Because even when its just idling, there are 100 small explosions every second inside of it with a powerful heavy metal crankshaft rotating 1500 times per minute. You could have a bad engine mount.
Tightening the bolts in the typical order from the middle out, the upper intake bolts torque in first pass at 44 in lbs, the second pass at 88 in lbs. The lower intake bolts start with 27 in lbsfor the first pass, 106 in lbs for the second pass and 133 in lbs for the last pass.