250 inline 6

[FreeBeeTony]

I may have the oportunity to buy a '78 204 Grady w/ a 250 inline 6 merc. The engine supposedly has a knock when its warm Also may come with another engine (same type). Is there anything else I should know about this set-up? I'm not too familiar with IO's. Any info would be appreciated.<br /><br />Thanks

 

[Trent]

Re: 250 inline 6

Very popular engine. 165 HP. Ifs its a 1978 it will have the Mercrusier I stern drive which parts are plenty. I would make sure the noise is really in the engine and not the outdrive. Outdrives can make you think its the engine somtimes. Several ways to do this. <br /><br />Look at the "bellows" with the drive up. (Hoses) and make sure none are cracked and broken to let water in. The drive will need to be pulled and the u-joints and driveshaft greased. Also grease the gimble bearing. Grease fitting is about 4 o'clock position on the stearn drive transom plate. Also find out when the last time the riser and exhaust manafold were changed? If its a saltwater boat they need to be changed about every five years to keep water from entering the engine by a rusted out riser/manafold.

 

[John Carpenter]

Re: 250 inline 6

In my opinion that is one of the best engines ever used in a boat...inline Chevy 6 with 251 cu. in. Smooth, fuel efficient and good low end torque. Also easy to work on and get parts for.

 

[flashback]

Re: 250 inline 6

I agree with both the guys above, you won,t find a more reliable engine. it is bullet proof. just keep oil in it.

 

[Doug Durako]

Re: 250 inline 6

Free Bee----I bought a runabout in 1990 with this motor and drive. It had 100 hours on it when I bought it. Sold it last year with 814 hours. We ran the snot out of it (boat full of kids, pulling three tubes, etc., etc.)<br /><br />Only thing I ever had to do with this motor was routine plugs and points. I did change oil every 40 hours in the motor and drive unit. Finally got tired of messing with points and put in the magnetic spark advance Overton's sells for about $100.<br /><br />Mine had the knock. Had two different mechanics take a look---said not to worry. It never affected performance. I am curious as to what it was.

 

[magster65]

Re: 250 inline 6

I had a rather loud knock in a motor that turned out to be the fuel pump... for what it takes it's worth checking.

 

[FreeBeeTony]

Re: 250 inline 6

bump

 

[FreeBeeTony]

Re: 250 inline 6

I just found out there is outdrive at all. How much should I expect to pay for a decent used outdrive? Any ideas where to look?

 

[DJ]

Re: 250 inline 6

Check this site-"iboats". <br /><br />It may be expensive, no matter where you buy, because you do not have a core.

 

[FreeBeeTony]

Re: 250 inline 6

BUMP