Originally Posted by Pikey Dave
Steve, the 'stats are mounted in the heads at the rear of the block as viewed from inside the boat. If you stand outside the boat looking towards the engine you will see 2 large plastic caps with hex heads about midway up the heads, one on each side. Off the top of my head I think they are around 24mm af. They should unscrew pretty easily. If you cant find 'em I'll scan the page from the manual & send it to you.
PS The idling temp should be around 65-70 deg C so your're not far off. What is the temp like at full chat?
Thanks, will have a look.
I plugged the computer in this morning and downloaded the EMM data - both the engine and the EMM look to have been getting a little warm as it had logged the faults below:
25 2 47:14 47:15 -- EMM temperature above expected range
RPM=0; TPS=0%; Baro=100Hg; Air=33°C; Port=103°C; Stbd=106°C; EMM=92°C; Exh=0kPa; WP=0psi; SV=52V; BV=14V
70 1 47:14 47:15 -- Engine temperature above expected range low speed - Starboard
RPM=648; TPS=0%; Baro=100Hg; Air=33°C; Port=108°C; Stbd=111°C; EMM=98°C; Exh=17kPa; WP=0psi; SV=56V; BV=14V
40 1 47:15 47:15 -- Engine temperature above expected range low speed - Port or single
RPM=550; TPS=5%; Baro=100Hg; Air=34°C; Port=110°C; Stbd=113°C; EMM=98°C; Exh=13kPa; WP=0psi; SV=56V; BV=14V
Given that the initial overheat warning was definitely associated with kelp round the leg, and I found some bits of it jammed into the leading edge intake holes, I am pretty sure that what happened is that it was wrapped around the leading edge of the leg and as the speed came up, some of it was squished in through those holes by the drag from the water pulling on the long kelp strands.
What I have noticed (because I watched the temp profiles when it was performing normally so that I knew what to expect) is that it's running warmer than it was. Before, when you opened the throttle to anything over 3000rpm the temp would drop off pretty quickly to 40 something and now it drops back much slower and sometimes doesn't come down much and stays at 60-70 but the odd thing is that it isn't at all consistent - I was fiddling yesterday and throttling up to say 4000rpm till the temp stabilised, dropping back to idle for a minute or so, then doing it again and it wouldn't do the same thing each time, sometimes the temp would drop back a lot and sometimes just a bit, very strange. So I think maybe there is some crap whistling around in a cooling gallery and occasionally blocking off some of the flow. I need another sea trial to see if the stuff I flushed out yesterday has solved the problem but just wondering where else it might stick in the system.