Volvo fl 10 lorry truck horn problem

The valve clearance specification for a Volvo FL10 truck depends on the specific engine model and year of manufacture. Generally, the valve clearance for the FL10 truck with a Volvo D10 engine should be checked and adjusted as follows: Remove the valve cover: Remove the valve cover to access the valves. Rotate the engine: Rotate the engine to the top dead center (TDC) position for the cylinder you want to adjust. Check the valve clearance: Use a feeler gauge to check the clearance between the valve stem and the rocker arm. The specification for the valve clearance should be listed in the engine service manual. Adjust the valve clearance: If the clearance is not within the specified range, adjust the clearance by loosening the lock nut on the rocker arm and turning the adjustment screw. Tighten the lock nut when the clearance is correct. Repeat for each cylinder: Repeat the above steps for each cylinder. Reinstall the valve cover: Once all the valve clearances have been checked and adjusted, reinstall the valve cover. It is recommended to refer to the engine service manual for specific instructions and specifications for your particular Volvo FL10 engine.

NO YEAR TOLD OR cOUNTRY OR ENGINE TOLD. (HARD CASE)
1985 to 2013?

not car, but is a huge heavy truck, we don;t have huge truck forum here. 12 to 21 TON rated. 9 ton load.
10 liter engine diesel . TD102

FL" stands for "Forward Control" and "Low-level Cab".[1] The FL6 and the larger FL7 and FL10 appeared in the summer of 1985.
sold until , year, ? IDK

my wild wild guess is a bad FUEL Pump.
or filters bad, or bad fuel, or lost pump prime. (air in lines or sucked in) injector failing. intermittently.



cuts out has huge list of causes. (fuel or lost DC power)
sure electric
sure lots of other causes
only tests done prove the pudd'n
cuts out means what>? engine stall ?
stalls fast, or slow.
engine misfires first (shake?)
or just bogs slow and stalls nice and easy stall.?

do any other electrics fail same time ,like head lamps, IP cluster goes dead, heater blower dies., radio dies. or?

HI TRY CHANGING YOURE RANGE CHANGRE VALVE

Check for power at the horn, if none the problem is in the steering wheel. If there is power, try a new horn.

http://www.2carpros.com/diagrams/volvo/s60/2004

A single horn is usually on a 10 or 15 amp circuit, so I would guess 5 amps.

check to make sure the horns have good and clean grounds

have the mechanic recheck his adjustments on the transmission range switch. the shifter shaft goes right throug the switch and it may have been adjusted or replaced when the backup lights were repaired

According to the Service Repair Manual (TP 31486/1, Section 3 [35-38], Lighting, Instrumentation and other electrical equipment dated April 1990) for a 1990 240 DL, the fuse that controls the windshield wipers and horn is Number 2 (second from top) and is a 16 amp fuse.