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Old 20 August 2012, 18:29   #1
Country: Ireland
Town: ireland
Make: yam 480r
Length: 4m +
Engine: yamaha autolube 40
Join Date: Dec 2011
Posts: 33
mercruiser wont rev out

hi posting this for a mate hes got a 1.7 diesel 120 mercruiser engine but it wont rev past 3000 revs he got a compression test done and all seems fine maybe somebody here could point us in the right direction

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Old 20 August 2012, 20:51   #2
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Country: Australia
Town: Sydney
Boat name: Lunasea
Make: Ribtec 890SX
Length: 8m +
Engine: Yamaha ME 421STI x 2
Join Date: Aug 2009
Posts: 472
A quick Google says it should rev to 4400rpm.

There are many factors to look at.

Did this boat ever reach these revs? If it didn't, then maybe it has the wrong prop. If it did, what has changed? Is there growth on the hull? Is the prop or drive leg dinged? Is there a lot if extra weight in the boat? etc.

Give us some more information including the type of boat, hours on the engine and some general history as a start.
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