The correct tune up procedures for your 4 cylinder , L-head Jeep engine are as follows. It is very important to follow the sequence or the final results will be less than satisfactory.
1. Remove spark plugs and clean or replace. Gap is set to .030
2. Check the battery and terminals, the engine ground strap and ground cable. The metal braided ground strap must be installed for proper starter operation and lighting connections.
3. Pull distributor cap; clean it ,inspect for cracks ( a minute crack can cause misfires) and check points for pitting and proper gap (.020) Grab the distributor post and see if any play exists. If so, a new bushing is easy to obtain and install.
4. Check ignition timing.
5. Check valve tappet clearances. Set to .016 for both intake and exhaust while cold or hot. Further detailed instructions on this procedure will be coming soon.
6. Remove crankcase ventilator valve from valve cover and clean. Clean fuel filter. Always a good idea to have an inline filter,even a new disposable one.
7. Check carburetor float level,accelerator pump travel and metering rod to specifications.
8. Adjust low speed idling screw on carburetor to idle smoothly.
There are many steps and details to be followed for keeping your Jeep running smoothly. It is well worth the money to invest your time and tools as most mechanics will not have a clue how to do this anymore.
Detailed carburetor rebuild will be posted soon.
