1981 6.5 onan

fpawn1 · Post by **fpawn1** » Sat Apr 09, 2011 7:13 pm

Does anybody know the inside dia of intake raw water hose? Need to order new flushing valve and won't be at the boat for a week.

Thanks all

koviak · Post by **koviak** » Sat Apr 09, 2011 7:25 pm

My 6.5 onan intake is 1/2" hose (1989)

Allen Sr · Post by **Allen Sr** » Sun Apr 10, 2011 6:13 am

Mine is 1/2" also. Just added a sea strainer and replaced my intake hose last week, also the thru hull and cut off valve.

alexander38 · Post by **alexander38** » Sun Apr 10, 2011 6:22 am

87 1/2 hose too.

aaronbocknek · Post by **aaronbocknek** » Wed Apr 13, 2011 6:14 am

all onan mcck models up until the very late 1990's use a 1/2 inch inner diam. hose for the cooling pumps. though small in size, you would be surprised at how efficient these were.