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Thread: 1978 Mercury 800 mid section
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05-05-2013, 08:24 PM #1
1978 Mercury 800 mid section
Alright everybody heres the question. I have found a 1978 Merc 800 with a 15" mid section...cool! The problem is it has manual trim... no hydro cyclinders. Is there any way to steal the hydro cyclinders off a 76' 20" merc mid section? Or am i stuck spending $700 on a trim tilt jack plate!
18' Mirage River Racer 2.5l
2006 Cyclone River Racer 225hp Looper-SOLD
16' 1979 Checkmate Predictor 2.5 EFI 260hp-SOLD
15' 1978 Hydrostream Viper 150hp- SOLD
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05-06-2013, 06:47 AM #2
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05-06-2013, 12:38 PM #3
Added to what Eagle has said.
Yes the 15 and 20 inch motors from this era take the same trim cyls. Its a 4 line two trim ram set up . One ram on each side in place of the shocks.
I think they started this system in the mid 60's . Ive used the same trim set up on my 60's motors up til the 80's 1986 they went internal.
Now the 800 was only made from 1969-1972ish I believe. Starting in 1973 it was called the 850 The 800 and 850 do not share bolt patterns. The 800 mid is the same as a 1350 mid. The 850 is the same as a 1500 mid.
So you can put a L-6 power head on these L-4 mids if you wish.
ConradL6fan57-88
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05-07-2013, 08:56 AM #4
Thank you sir for the advice
I believe in 1978-79 the brought back the 800. Why those years i don't know but the serial number reads 4832133. i have a 74' 50hp with a 20 " mid and i'm going to try to swap the trim over to this 78' 800 with a 15" mid and hope it works. Looks like it would bolt right up! we'll see18' Mirage River Racer 2.5l
2006 Cyclone River Racer 225hp Looper-SOLD
16' 1979 Checkmate Predictor 2.5 EFI 260hp-SOLD
15' 1978 Hydrostream Viper 150hp- SOLD
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05-07-2013, 09:44 AM #5
I did not know they had an 800 during those years. I thought it was always the 850! Thanks for the info, I learned something today.
But as far as the trim goes they should transfer back and forth .
I know in those years the big L-6's were being renamed as well. The 1500 became a 1400 with slight changes. Might just be the same thing.
Conrad