Firing order and vave clearance - 1990 Nissan Sentra

Hi. Thanks for your question. For assistance on clearance and firing issues you can visit https://www.reliable-store.com and download the entire workshop manual which includes all the information along with the diagrams for better understanding. Good day!

there is nothing on the net so you have 2 options
call a yamaha service center or pull the rocker covers off and check the position of the rockers
when no 1 is on compression the valves will have max valve clearance so that is no 1 position
the firing order will be either 1,3,4,2 or 1,4 2,3 so the next piston to fire will be the next piston to get max valve clearance and so on
lot easier to just call a service dealer

there is no specification for what you want
the valve clearance is between the end of the rocker arm and the end if the valve stem
the stem end is proud of the spring retainer so if your rocker arm is touching the spring retainer , you have a big problem as for the procedure it is set out in the workshop manual but if you don't have a manual it can be done like this
you will need the firing order of the engine first
now adjust no 1 piston valves when the next piston to fire has the valves in the rock position
that is the exhaust valve just closing as the inlet is just opening a bit of movement of the crank makes either valve move up or down
adjust no 1 piston valves
now move on to the next piston to fire and adjust the valves that were rocking
follow that procedure until all the valves are adjusted
for example
on a 4 cylinder engine with a firing order of 1--3--4--2
bring up no 1 piston and adjust the valves when the valves on no 3 piston are rocking
next piston to fire is no 4 so adjust no 2 piston valves
next piston to fire is no 2 so adjust the valves when no 1 valves are rocking
the procedure is the same for engines with any number of cylinders

360 with hydraulic lifters, the crankshaft wit a ratchet and socket to get each valve closed. When lifter is at bottom turn the valve adjuster out to where you have free movement then turn adjuster till the rocker arm touches the lifter, then turn the adjuster in three quarters of a turn, and that valve is adjusted. No other clearance is required on hydraulic lifters. Do this with each valve in turn as each piston comes to top dead center using the firing order as a guide. When #1 piston is up to top dead center, both valves are closed. Adjust intake and exhaust at this time. Then the next in the firing order. The firing order can be found on the intake as is each cylinder marked with it's number. If it were a Chevy small block, for example only, firing order is 1-8-4-3-6-5-7-2. I would bring # 1 cylinder up to top dead center on compression stroke by removing that spark plug and stick my finger in the hole and crank the engine till I felt my finger being pushed away with compression, then bring that piston up till the timing mark was on the "0" of the timing tab at drivers side of the harmonic balancer on the crank. Adjust both valves on #1 cylinder and then turn the crank until both valves of #8 cylinder were free moving at the rocker. Then to the next in order of fire. I would turn each adjuster out at least one full turn before starting this procedure, then adjust them in order of firing starting with #1. It isn't hard, just takes time to do it right.

If you have adjustable tappets bring the engine to top dead center no 1 piston firing The rocker will be on the back of the cam lobes. Inlet .010" hot exhaust .012" hot and then turn until next firing piston is in position. Go by firing order. I suspect that a 1997 model would have hydraulic adjusted tappets which means no manual adjustment. If it is rattlly I would be checking for worn rocker shaft and rocker bushes.

i am suggesting you a link from where you will get the the diagrame http://toolsnyou.com/

Tune Up

Spark Plug

AWSF-42C

Spark Plug Gap

0.044

Ignition Timing

10 degrees BTDC

Firing Order

1-4-2-5-3-6

Distributor Rotation

Clockwise

Valve Clearance Intake

0.014

Valve Clearance Exhaust

0.016

Hi The firing order is 1 3 4 2 So do the clearance in that order.
I hope this is of some help to you
John ( South Wales UK )

Click on the following direct Link for the Timing Belt Marks:
http://www.2carpros.com/car_repair_information/year/1995/make/mitsubishi/model/mirage/1995_mitsubishi_mirage_timing_belt_diagram_marks.htm
Click on the following direct Link for the Firing Order/#1 Piston Diagram for the 1.5L Engine:
http://autorepair.about.com/library/firing_orders/bl-fo-6825.htm
Click on the following direct Link fo rthe Firing Order/#1 Piston Diagram for the 1.8L Engine:
http://autorepair.about.com/library/firing_orders/bl-fo-6826.htm

Let me know what size Engine: 1.5L or 1.8L for the Valve Clearance information.

well first you need to know the firing order...if it's a small block chevy the firing order is 18436572. You need to write the second four digits underneath the first four digits.

so it looks like this 1843
6572

This will let you know which rocker to adjust...turn the engine over by hand using a rachet on the crank shaft bolt by the harmonic balancer until you get both rockers for number 6 cylinder moving at the same time. Now you may adjust the clearance for both rocker for number 1 cylinder. Then crank the engine over by hand again until number 5 cylinder rockers start to move. Now you can adjust the clearance on number 8 cylinder. You will need to know the manufacturer specs for the valve clearance...continue until all rockers have been adjusted.

Note: The engine should be warm when you make the adjustment.

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