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Old 05 December 2007, 13:14   #1
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Mariner 40hp Oil Injection

I've got this outboard for my searider. It all runs fine, and the oil injection seems to be working fine.

Its a 1996 model, so I'm guessing its one of the last of the yamaha based 40's (as used by the rnli) but with oil-injection fitted, to compete with the more modern outboards at the time?

It seems quite a rare model, I can't find much info, want to find the specs etc.

Anyone got any experience/opinion on the injection system? seen plenty of the pre-mix models, not seen this one before.
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Old 05 December 2007, 13:47   #2
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http://www.evolutionribs.co.uk/gallery/gallery/9.jpg
That was my 96 mariner 40 oil injection. If its the same as mine it a Mercury one not a Yam. If it is the same pm me your email address and I'l send you the manual.
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Old 05 December 2007, 14:17   #3
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http://www.evolutionribs.co.uk/gallery/gallery/9.jpg
That was my 96 mariner 40 oil injection. If its the same as mine it a Mercury one not a Yam. If it is the same pm me your email address and I'l send you the manual.
Thanks for the reply, its definatly the Yam based model. The previous owner bought it new from the dealer in 1996, but it may have been manufactured in 1995.

It looks the same as the normal premix ones from the side, but is wider, tried to show this in the photo:
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Old 05 December 2007, 18:08   #4
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I think you'll probably find that it's identical to the all the Mariner/Yamaha 40hp twin cylinders made from the late '70s to the '90s but with an autolube system and identical to most of the ex RNLI motors out there apart from the autolube. Parts and data won't be a problem from a dealer.
Cracking motors and it'll make your sr4 fly.
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Old 05 December 2007, 18:18   #5
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Originally Posted by Nos4r2 View Post
I think you'll probably find that it's identical to the all the Mariner/Yamaha 40hp twin cylinders made from the late '70s to the '90s but with an autolube system and identical to most of the ex RNLI motors out there apart from the autolube. Parts and data won't be a problem from a dealer.
Cracking motors and it'll make your sr4 fly.
Had a look at the parts list and diagrams at a dealer, but we couldn't find the specs for this particular motor. I'm guessing everythings going to be the same, but with a few extra kg's in weight for the autolube??

Can't wait to get it on the boat, been at uni for the last 3 months, finally got a few weeks to think about the rib again!
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Old 05 December 2007, 18:37   #6
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Had a look at the parts list and diagrams at a dealer, but we couldn't find the specs for this particular motor. I'm guessing everythings going to be the same, but with a few extra kg's in weight for the autolube??

Can't wait to get it on the boat, been at uni for the last 3 months, finally got a few weeks to think about the rib again!
Should be about right. Those twin cyl yammies are fantastic lumps. Does it have an hour meter under the cowl by any chance?

TurboDiesel would be the guy to ask for a definitive answer for anything to do with them though as it'll probably have been sold by Barrus in one way shape or form when new.
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Old 06 December 2007, 08:36   #7
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Hello,

Yes its a Yamaha based engine. Very good engine. The Autolube will have been fitted after the RNLI had finished with it. The engines come back to Barrus and get de-modified, PIRS taken off, etc etc. Then either get made into a long shaft, or short. Some go out as electric start and some with Autolube. The spec depended on what the dealer that would sell them on wanted. If you have a questions about specs etc, let me know.
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Old 09 December 2007, 19:01   #8
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Should be about right. Those twin cyl yammies are fantastic lumps. Does it have an hour meter under the cowl by any chance?
Theres no hour metre. It definatly seems very good mechanically, theres a couple of minor parts that have corroded, such as the steering tube, so hopefully replacing these.

The props 10 1/2" pitch, (cant be sure till later in the week), any idea what sort of size would be suitable for the SR4? 10.5 just sounds abit low to me??

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Hello,

Yes its a Yamaha based engine. Very good engine. The Autolube will have been fitted after the RNLI had finished with it. The engines come back to Barrus and get de-modified, PIRS taken off, etc etc. Then either get made into a long shaft, or short. Some go out as electric start and some with Autolube. The spec depended on what the dealer that would sell them on wanted. If you have a questions about specs etc, let me know.
I've found the diagrams for it here: http://www.mercruiserparts.com/selec...doc_nbr=814840

Still can't find any specification for it (40 ELO), most interested in finding the weight .

Thanks
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Old 09 December 2007, 19:19   #9
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Are you sure that's not 10.5" diameter rather than pitch? Pitch should be stamped on it too.
As for prop pitches, do you know the gear ratio of the lower unit?
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Old 09 December 2007, 19:23   #10
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Are you sure that's not 10.5" diameter rather than pitch? Pitch should be stamped on it too.
As for prop pitches, do you know the gear ratio of the lower unit?
I'm pretty sure thats the pitch, It was probably used on a heavier boat. Just wondered what size props were usually used on the sr4's? Gear ratio is 2.00:1
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