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Slow throttle response

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Rob-K View Drop Down
Sub Lieutenant
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Joined: 29 September 2016
Location: Christchurch
Status: Offline
Points: 5
Post Options Post Options   Thanks (0) Thanks(0)   Quote Rob-K Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2017 at 14:41
I do have a folding prop but that is not the issue because there is a long delay (1 or even 2 minutes) before the revs increase.  So far I have been living with the problem and trying to anticipate it by selecting reverse early when I approach a pontoon.  It makes life more exciting!?

Once the boat is laid up for the winter I will get the tools out and find out whats going on.  With a bit of luck I hope to have an answer before spring....watch this space..
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AlanL View Drop Down
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Joined: 17 July 2017
Location: Gosport
Status: Offline
Points: 13
Post Options Post Options   Thanks (0) Thanks(0)   Quote AlanL Quote  Post ReplyReply Direct Link To This Post Posted: 19 hours 31 minutes ago at 15:49
So I discussed this today with some of the guys at MarineTech in Gosport (who were very helpful) and just happened to have a similar engine in bits in their shed, including the governor.  Having discussed all the symptoms, they seemed to think it must be a fuel problem of some sort.  One thing that came out was that the pipes that I have in my fuel system are clear and apparently are actually water pipe!!  These tend to go brittle and are dangerous, and one side effect may be that the seals around them could be poor, even when apparently fully tightened, such that as the engine heats up so we start to suck air.  This could also explain what has felt like a drop off in performance over time when running with the engine.
 
Rob-K, have you checked your fuel lines/connections?  We did also discuss the governor as they had one apart and while there may be issues with the return spring they could not see that producing the effect I am seeing, and the other alternative of a weight being thrown shoudl be very obvious from the clatter when the engine is running.
 
My next step is to replace all my fuel lines with some certified fuel pipe, check all the connections, service the engine with all new filters, and see if it still happens.  But that won't be until next season now.
Hobo
Hanse 301
GBR 2996L
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