Originally Posted by ralfreds
Hi my hour log on my Volvo motor
only works occasionally. It is a digital readout on the Tach. 90% of the time I cannot read it and occasionally it shows up. Any ideas?
Welcome aboard CF!
Is this a D2-55 with a 150S sail-drive you're talking about?
If the display is clean (i.e. no broken LCD sectors etc) when it does display the engine
hours in LCD display on the tachometer, then it could be worth checking to fuse-box at the other end.
If I remember rightly, it'll be located on the upper right-hand limb of the block (looking aft) below the Volvo sign - most of the electrical/instrument connections to the engine
terminate in that box - you may have a corroded, cracked or detacted terminal there.. worth having a look!
In addition, the tachometer cable connection is on the back of the alternator
(looking aft) that may well have the detacted/corroded/cracked problem too!
This will be obvious if, when the display returns, the engine hours have increased since it went off (but you've still run the engine for some hours): then you have a display problem and not an instrumentation problem.
The only other obvious option, other than a cracked cable, is a dry/racked solder in the techometer unit itself (on the LCD display legs) - if you have a soldering iron and a magnifying glass this is easy to check for and repair.
As the engine is the bit which is vibrating when on, it's more likely to be something at the fuse-box end of the instrument cables!