What is a tappet shim?
Double overhead camshaft engines The tappet clearance adjustment is typically set using a small shim, located either above or below the tappet. Shims were made in a range of standard thicknesses and a mechanic would swap them to change the tappet gap.
How to check the clearance on a tappet?
When you try to check the clearance the feeler gauge bridges the hole and gives you a false reading. Dont know of any way of checking for the “wear holes” apart from undoing the rocker shaft pedestals from the head (evenly) and lifting the whole assembly out and have a look.
Where is the clearance on a TD42 tappet?
Worth checking for wear on the rocker arms while you are at it. Td42s have a habit of wearing a circular hole in the arm where it contacts the valve. When you try to check the clearance the feeler gauge bridges the hole and gives you a false reading.
What kind of variable valve timing does a Nissan use?
Many standard DOHC Nissan engines featured Variable Valve Timing, such as the VG30DETT, and as such do not use the “V” designation. “V” designation is only if the engine has variable valve lift. A good example of an engine where not all of the feature designation spots are used is the L28ET engine.
How many ports does a Nissan CA18DET have?
The late model Japanese CA18DETs received 8 port (low port) heads, with butterfly actuated auxiliary ports in the lower intake manifold which corresponded with 8 ports in the head. Below c. 3,800 rpm, only one set (4 ports open, 1 per cylinder) of long, narrow ports would be open, accelerating the intake charge to the cylinder.
What’s the compression ratio on a Nissan FJ20ET?
The FJ20ET engine has an 89.0 mm (3.5 in) cylinder bore and 80.0 mm (3.15 in) piston stroke. The compression ratio is 8.0:1 for the engine without intercooler and 8.5:1 with intercooler.
Many standard DOHC Nissan engines featured Variable Valve Timing, such as the VG30DETT, and as such do not use the “V” designation. “V” designation is only if the engine has variable valve lift. A good example of an engine where not all of the feature designation spots are used is the L28ET engine.
The late model Japanese CA18DETs received 8 port (low port) heads, with butterfly actuated auxiliary ports in the lower intake manifold which corresponded with 8 ports in the head. Below c. 3,800 rpm, only one set (4 ports open, 1 per cylinder) of long, narrow ports would be open, accelerating the intake charge to the cylinder.
How big is the intake valve on a Nissan KA24E?
Intake valves are 34.0 mm (1.34 in) in diameter and the exhaust valves are 40.0 mm (1.57 in). The intake valve duration is 240°, valve lift is 10.4 mm (0.409 in); the exhaust valve duration is 248°, valve lift is 10.4 mm (0.409 in). The KA24E rev limiter is set on 6,500 rpm.