rmlsll
Active Member
- Oct 11, 2009
- 242
- Boat Info
- 340 Sundancer 2004 (SOLD)
24' Avalon Tritoon 2019
10' Zodiac (WENT WITH 340)
- Engines
- Twin 8.1 Mercruiser V-Drive
150 hp Mercury outboard 4 stroke
I have a 2007 240 sundeck with a 5.0 merc MPI / Bravo 3. After replacing both heads, exhaust manifolds, risers and adding closed cooling experienced a bent exhaust valve on No 4 cylinder of the new head. Replaced new head with another new head and it happened again. Bent exhaust valve No 4 cylinder. Any ideas ? We are thinking wrong / weak spring, but why same valve twice on two different heads. Runs great at idle. experienced the problem at around 3500 rpm both times.