I have a problem with my Renault engine concerning load change, if i put the engine in forward gear and throttle to 1/4 or 1/2 of is course, the engine can take 30-45 sec, to react to that change of load; setting the anchor in reverse gear the engine will not pick-up any speed at all, but will run ok if you back-up normally. When the boat reach is speed ex; 5-6 knots,it can run like that for hours with-out a glitch. I tought it was the fuel system, re-bleed but every thing was ok. Does any-one know if that engine is equip with a governor system to maintain rpm under load changing or is the fuel injection pump that required to be service. Thank's in advance Marc
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Renault engine response.
I'm not sure if your talking about an actual acceleration problem with the engine or the prop slipping in the water. When I go to full power it usually takes a few moments to start moving water through the prop. Up to that point it's like spinning your tires in the snow. In reverse after I set the anchor I don't get any speed unless I'm dragging the anchor. If the anchor is set, again it's like spinning your wheels. I've only dealt with an inboard engine for a couple years so I am certainly a novice. It does sound pretty normal for the little 8HP engine though. Sorta like a Timex. It just keeps on ticking.
I'm not sure if your talking about an actual acceleration problem with the engine or the prop slipping in the water. When I go to full power it usually takes a few moments to start moving water through the prop. Up to that point it's like spinning your tires in the snow. In reverse after I set the anchor I don't get any speed unless I'm dragging the anchor. If the anchor is set, again it's like spinning your wheels. I've only dealt with an inboard engine for a couple years so I am certainly a novice. It does sound pretty normal for the little 8HP engine though. Sorta like a Timex. It just keeps on ticking.
timing
Check the fuel injection pump timing. On a Yanmar G10 is 15 degrees BTDC. Don't know for Renault. Clean fuel filter and water separator. Make sure the transmission engages right away(have someone look at the shaft as you shift) If no problem above, check the prop. A sticking folding or loose prop may cause a lag. This boats are underpowered but a 30 seconds lag definitely shows a problem. Inside 10 seconds would be adequate. Good Luck
Check the fuel injection pump timing. On a Yanmar G10 is 15 degrees BTDC. Don't know for Renault. Clean fuel filter and water separator. Make sure the transmission engages right away(have someone look at the shaft as you shift) If no problem above, check the prop. A sticking folding or loose prop may cause a lag. This boats are underpowered but a 30 seconds lag definitely shows a problem. Inside 10 seconds would be adequate. Good Luck
Thank's Benny for the information, that's exactly what i tought, i think i have the injection pump redone this winter
Transmission check
I too am a bit confused by the symptoms you describe. If the Renault is pushing you along at 5-6 knots, sounds like the engine itself is fine and the transmission may be the problem. I just rebuilt the transmission on mine last month - they are actually pretty simple with maybe 5 moving parts. First thing I would do is to check forward and reverse while in the slip - you can power up and just see how tight your dock lines get. Regarding the transmission: the sliding of the double cone on the splined section of the secondary shaft (what your prop shaft is bolted to) could be impeded in some way. Metal shards in the oil could be keeping the double cone from nesting well into the inward cavities on the forward and reverse gears. There really is no clutch on these things - your gear shift just slides the double cone towards either the bow (forward gear) or the stern (reverse gear) and then the load pushes the double cone tighter against the selected gear face. So...change the oil in the tranny and see if it clears up. Good luck.
I too am a bit confused by the symptoms you describe. If the Renault is pushing you along at 5-6 knots, sounds like the engine itself is fine and the transmission may be the problem. I just rebuilt the transmission on mine last month - they are actually pretty simple with maybe 5 moving parts. First thing I would do is to check forward and reverse while in the slip - you can power up and just see how tight your dock lines get. Regarding the transmission: the sliding of the double cone on the splined section of the secondary shaft (what your prop shaft is bolted to) could be impeded in some way. Metal shards in the oil could be keeping the double cone from nesting well into the inward cavities on the forward and reverse gears. There really is no clutch on these things - your gear shift just slides the double cone towards either the bow (forward gear) or the stern (reverse gear) and then the load pushes the double cone tighter against the selected gear face. So...change the oil in the tranny and see if it clears up. Good luck.
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