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Computer diagnostic hookup

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Doshlaw

New member
I have a 2000 Mercrusier 305 cid 220 hp engine. Where do you hook up the computer to the engine to do a diagnosis? Also, how do you tell if the engine is carborated or fuel injected? As you can tell I have little mechanic knowledge.
 
Hi there, do you by chance have the engine serial number handy? if not would you be able to post a photo of the engine?

With fuel injected engines you'd be able to connect up a "marine scan tool" to read some info...The carbureted engines don't utilize the scan tool<But on some models you could read engine hours "only" if they have the right adapter.

Sometimes you'll be able to get your basic information from reading the sticker decals on the engine sometimes found on the mercruiser flame arrestor/valve cover area.

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The 5.0L 305 cid engine # is 0L687886.
I also have a 1997 5.7L 350cid Mercrusier engine in another boat. I was wondering if I could swap engines to get more hp for my Maxum 2400. I run the 5.0L at 6200 ft. elevation and have read that I lose 3% power for every 1000 ft of elevation. I can't get the boat to do more than 29mph at 4000 rpm. The 4000 rpm is the max I can get. I have changed props without much change is performance. The 5.7L # is 0K152955. The 5.0 has an electronic ignition module on the port riser. I can't find an eim on the 5.7. Any thoughts? Thanks for trying to help.
 
They are both carbureted engines. The only info a scan tool would read is engine hours and that's if you can find someone with the correct adapter.

Sure you could swap them over but there's a chance that the gear ratio is different between the two engines. And the gear ratio could be one of your problems of only getting to 4000 RPM.. You could also have a carburetor jet size problem you may have to address as well. Maybe Rick can explain that a little better than I.

For some reason my computer/s is having major issues while writing anything out on this forum, so I don't post as much here anymore.

To help with gear ratios, we'd need your gear ratio from both your outdrives. The numbers should be found on the side of the upper driveshaft housings. If not, post the serial numbers of the drives if you have them also normally found on the upper units.

Good luck.:)

MERCRUISER - (5.7L H.P. (1997M) Serial No: 0K152955 Model No:457B100KT Parts Catalog No: 90-81659697 Service Literature for MERCRUISER TB5, W/PS, TWOPCEX, WORO 5.7L ALPHA

MERCRUISER - (5.0L H.P. (1998M) Serial No: 0L687886 Model No: 4M11025N1 Parts Catalog No: 90-816596-98 Service Literature for MERCRUISER 5.0L ALPHA 5.0L ALPHA
 
Thank you for the information. I really appriciate you taking the time to help.
I do have the drive #'s as follows:
5.7L 0K048205 5.0L 0L784492

Transom #'s 5.7L O202667 5.0L 0L869237

Any information on the gear ratio's or carb jets would be great. Thanks
 
The transom number for the 5.7 is 0K202667.

I have some trouble with posting here also. The site drops some of my typing.
 
Doshlaw said:
Thank you for the information. I really appriciate you taking the time to help.
I do have the drive #'s as follows:
5.7L 0K048205 5.0L 0L784492

Transom #'s 5.7L O202667 5.0L 0L869237

Any information on the gear ratio's or carb jets would be great. Thanks
Click to expand...
You are welcome & Thanks for the numbers!

Just as I suspected. The MERCRUISER - (ALPHA H.P. (1998) with Serial No: 0L784492 is Model No: 5121300LS Parts Catalog No: 90-80975998 has a 1.62:1 gear ratio. Service Literature for MERCRUISER ALPHA 1.62 DRIVE ALPHA 1.62:1

While the MERCRUISER - (ALPHA H.P. (1997) with Serial No: 0K048205 is Model No: 5010147KS Parts Catalog No: 9080975996 and has a 1.47:1 gear ratio from new. Service Literature for MERCRUISER STANDARD ROTATION ALPHA 1.47:1
 
Is there something I can do to change the 1.62:1 gear ratio to help with the issue of the 6200 ft elevation issues of 4200 rpm and 29 mph max??? Once again, thanks for the information. This stuff is totally foreign to me.
 
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