1986 Nissan Truck Repair Question
Mileage: 125,000 miles.
Need to know where timing marks and rotor should point and top dead center
Asked by craigcooperAnswer
Installation
1. Ensure No. 1 cylinder is at TDC on compression stroke. Install crankshaft sprocket, oil pump drive gear and oil thrower (if removed). Mating marks on crankshaft sprocket must face front and large inner chamfered area of oil pump drive gear must face engine rear.
2. Place timing chain on camshaft sprocket. One Silver colored link on chain must be aligned with No. 2 dot on outer camshaft sprocket. The Second Silver link on chain must align with dot on crankshaft sprocket.
3. Install camshaft sprocket and timing chain. Ensure No. 2 hole on camshaft sprocket is fitted to camshaft knock pin. Install timing chain guide and tensioner on right side of timing chain. Ensure chain guide is installed tight against chain.
4. Install chain guide on left side of timing chain. Adjust the protrusion of chain tensioner and chain guide to zero. To complete installation, reverse removal procedure. With components installed, slowly rotate crankshaft to ensure pistons do not interfere with valves.
The so called silver links could be slightly darker in shade. I they are covered in oil, it would be difficult to distinguish, wipe them clean and dry and you shold be able to differentiate.
I could not find any reference on the distributor installation but what you have would mean the distributor is 180 degrees off. Before you do anything, ensure the # 4 cylinder valve are overlapped.
TDC can mean beginning of compression or intake stroke.
If markings are correct and distributor needs to be reinstalled, pull it out. There is a punxh mark on the distributor end gear. On housing there is a detent or triangular arrow mark. Match the two points and you have the rotor at # 1 firing position. Plug distributor in, remember to note the position of the holding bolt. The rotor would turn slightly when it goes in due to the gear sliding in.
With # 1 cylinder at TDC on compression stroke,
One more diagram for you.
First off,I thank you for your help. I am sorry I am not currently in a position to donate any funds at this time.It wont be until this weekend until i get back to it.I do know that the wiring diagram you provided is different than the chilton manual.It shows #1{intake}to be where your diagram shows#4E to be .Is it possible someone has rewired the distributor previously,and i am paranoid.Because as i have it,i could not feel any valve to piston interference.I have compression,both intake&exhaust valves are closed,and according to the diagram you provided,this engine,the rotor points toward 2e and thats where the #1I wire is at.
Guess someone had the timing wrong by a tooth or two and decided to change the location of the # 1 cylinder. It is ok, it would still work without any problem. Important thing is the timing chain is installed correctly.