Mercruiser 3.7 / 470 Holley EFI Sniper.

sronza

Seaman Apprentice
Joined
Jan 28, 2012
Messages
36
Heres my cam seal fix on 3.7 mercruiser.
machined a stainless insert and bolted on end of camshaft.
 

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Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
49,504
harden it. the factory cam snout was not hardened

or put a speedy sleeve on it for the seal to ride on
 

sronza

Seaman Apprentice
Joined
Jan 28, 2012
Messages
36
Here us the installed Sniper. Had to go up and out 1” on sniper. 1” spacer on intake and head caused interferance with distributor. Also installed an alternator as seen in pic.
 

Scott06

Admiral
Joined
Apr 20, 2014
Messages
6,408
Here us the installed Sniper. Had to go up and out 1” on sniper. 1” spacer on intake and head caused interferance with distributor. Also installed an alternator as seen in pic.
Glad to hear it worked out no photos were attached though...

Is it running?
 

sronza

Seaman Apprentice
Joined
Jan 28, 2012
Messages
36
I believe sniper whats 190 degrees. What will the boat run at ? Ive never run this motor. It came to me in pcs.
 

todhunter

Canoeist
Joined
Sep 15, 2020
Messages
1,308
AFR = air fuel ratio. You can monitor it on the touch screen. If you go too lean, boom (like me). I believe the sniper doesn't turn on "learn" mode where it tunes itself until above 160F. I'm not familiar with your engine, but mine had a 140F thermostat, so it would never learn. I switched to a 160F thermostat, and even still, it would bounce in and out of learning if you did nothing further. Supposedly you can adjust the coolant temp enrichment (to be at 100%) and AFR offset (to be zero) by the time your desired engine operating temperature is reached to make it enter learn mode sooner if you want. Further reading here:

 

sronza

Seaman Apprentice
Joined
Jan 28, 2012
Messages
36
According to Holley. it doesnt matter if the coolant temp is 160,170,or 180 for learn mode. There are posts online of oeople getting faulty coolant sensors. These faulty sensors read up to 20deg under actual temp.
i will post more on this when i get it running. That will be next week.If remaining assembly goes well.
 
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