Question about oil
filling on my Yanmar
4JHE. This engine
has two oil
filler caps--one on the valve cover on top of the engine
and one lower on the timing gear
housing. There appears to be only one dipstick, measuring oil in the main sump.
Why are there 2 oil filler caps? I have only added oil from the top cap, into the valve cover opening. Is the other one there only as an accessory in case the upper one is unavailable due to space restriction? When I look into the timing gear
space through the oil filler cap the gear appears wet with oil.
Cannot find instructions/explanation in service
or owner's manual.