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And it works the other way to - having a 2004 or even 2005 boat hull but you can still have an 2003 engine. This all goes by Mercruiser engine serial number and or GM block codes to what cam sensor is used.
Give me your engine serial number and I will look at to make 100 % sure what cam sensor you have. Also if you own the early 496 you wont be screwed - If currently what I had made does not work correctly - I surely will have it remade to work correctly. Again the problem is testing them - I do not have an earlier 496 in my hands nor did I last year. Our area was hit with extreme flooding that knocked out boating 85% of last year. The company that made these sensors for me is located in the USA. You are not screwed with owning an earlier 496. I already have or will have the part that is needed. |
My boat is a 2004. My engine, per Mercury on the engine information label on the heat exchanger, was manufactured 9/2003. My serial number OM683216, shows it taking the NLA sensor. However, that is not what is installed on the engine. He said everything is the '04 + setup. Said GM must have done a mid-year split due to parts availability. I will be taking a new '04 + sensor with me to verify when the engine is dyno'd here soon.
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Originally Posted by BUP
(Post 4410607)
It goes by GM block code on the bottom side of the block or Mercruiser engine serial number per which cam sensor gets installed. The reluctor on the cam gear was changed about 4 different times thru out the whole 496 timeframe (existence) The first 2 cam sensors are NLA.
Long story I will post this info down the road. I probably was one of the first back some years ago to discover about the cam sensor NLA for the marine side as the available cam sensor was totally wrong for the earlier apps. Anyways I have no idea what GM or EBAY has to offer for mercruiser. Volvo went a different route. What I did years ago was a search thru Merc as to what dealers had cam sensors left sitting on their shelves but DID NOT tell them the reason why. These cam sensor were Merc part numbers not GM or anyone else. I bought as many I could at that time frame. So last year I was down to just 2 cam sensors so I decided to have them made again I only had 11 made and have no testing time with them. Another reason I had such a small number made was I wanted to test them before anything else. I can careless what EBAY has because alot of marine ignition and marine electrical products are china junk copies even junk copied fuel injectors that either do not work or fail in sort order or do not perform like they should. I can not tell you how times I have seen bad ign modules or ign sensors or fuel injectors with bad spray patterns that the end user has bought off ebay. Like I said I took 2 new KNOWN good cam sensors and tested them from Merc packages and sent them off along with 2 used KNOWN bad cam sensors. It would be 100% very wise that I get test time from whoever and where ever before I just send them to you. I would never just assume that we are good to go without testing these plus I like to keep my name good out in the marine market place. I can show up with them and scanner in hand. The problem is, have not had any early 496 in my hands since these were made. That would figure - just the way it goes. |
K4M your engine is a 2004 - your serial was ahead of the NLA cam sensors.
Here is the deal Mercruiser 496 mag engine serial number 0M672041 - block code 4XW and above you are good to go but ORDER THE LASTEST CAM SENSOR THRU MERCRUISER ONLY. This cam sensor has changed 5 times now. DO NOT ORDER THIS ONLINE. They are clueless. So is the car stores. Do not order from Rock auto. Order thru a OEM Mercruiser dealer only or me. You will have a Warranty if something happens. Keep your receipt 4 ever. Mercruiser 496 HO MAG - engine serial number 0M667238 - block code 4XA and up you are good to go - SAME JIST AS ABOVE. Do not mess around with cam sensors. K4M your engine serial number is above these so you can and will use the latest cam sensor that is available thru Mercruiser. AGAIN - OEM MERCRUISER dealer or me. |
John in New York you have the NLA cam sensor. What I have would take about 2 to 3 hours of test time. I triple check everything and would have my scan tools and meters. I would have to log everything and compare between your original sensor and then what I have. I also will need to measure them as well before we change out..Thanks
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Originally Posted by BUP
(Post 4414302)
K4M your engine is a 2004 - your serial was ahead of the NLA cam sensors.
Here is the deal Mercruiser 496 mag engine serial number 0M672041 - block code 4XW and above you are good to go but ORDER THE LASTEST CAM SENSOR THRU MERCRUISER ONLY. This cam sensor has changed 5 times now. DO NOT ORDER THIS ONLINE. They are clueless. So is the car stores. Do not order from Rock auto. Order thru a OEM Mercruiser dealer only or me. You will have a Warranty if something happens. Keep your receipt 4 ever. Mercruiser 496 HO MAG - engine serial number 0M667238 - block code 4XA and up you are good to go - SAME JIST AS ABOVE. Do not mess around with cam sensors. K4M your engine serial number is above these so you can and will use the latest cam sensor that is available thru Mercruiser. AGAIN - OEM MERCRUISER dealer or me. Thanks for looking my serial number up and verifying thru Merc. |
BAM has it in their notes CORRECTLY under your engine serial number - BAM site lists correctly and states base - 0M672041 and above - under block code 4XW. Your serial number is above - 0M683216 mercruiser model year 2004.
So I have to ask what or how did you see the serial number was wrong compared to what I posted. It shows the exact samething. Just asking ? |
There is a BWD brand cam sensor available for the earlier 496. Chinese but it works. Installed several with no issues.
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Originally Posted by BUP
(Post 4414304)
John in New York you have the NLA cam sensor. What I have would take about 2 to 3 hours of test time. I triple check everything and would have my scan tools and meters. I would have to log everything and compare between your original sensor and then what I have. I also will need to measure them as well before we change out..Thanks
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Originally Posted by Vortec Bandit
(Post 4414545)
There is a BWD brand cam sensor available for the earlier 496. Chinese but it works. Installed several with no issues.
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Have their catalog in my hands it is not for the earlier marine app 496.
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https://www.pepboys.com/product/details/9769746/00715
NLA and NLA at all the auto parts store. Been there and done it and have the T shirt for it. Maybe can find something on an old shelf sitting around new in the package or left over online but you will have to have some luck and time involved. And if you love google. BWD is not a Borg Warner Division - they sold that end a long time ago. The quality is not the best to say the least. I would rate as average |
I have OM637000 and OM637001. What sensors do I need?
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[QUOTE=BUP;4414536]BAM has it in their notes CORRECTLY under your engine serial number
I was going off of this where the cutoff is OM687082 --> http://www.mercruiserparts.com/bam/s.../6272/6708/110 I don't remember 2 sensors being listed last time I looked this stuff up over a year ago. I could have sworn it just showed the NLA sensor. Then again, I could have had my head up my butt like I often do. Looking at the notes on the sensor that is still available I now see where my serial number falls under the sensor that is available. |
I've been reading this and other posts and still can't seem to find the hp and torque numbers for a 496 mag 375 hp. Does anyone have them?
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Originally Posted by Pol83x
(Post 4493751)
I've been reading this and other posts and still can't seem to find the hp and torque numbers for a 496 mag 375 hp. Does anyone have them?
The torque on the Mag is around 500 ft lbs at 3000 rpm. |
Ok, I was looking to see a printout at rpm sheet or curve graph preferable between 3000-5000 every 100 rpm
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I dont know where theres a stock dyno sheet. Google "Dana Marine 496 Mag/HO". There is a lot of data on the internet with dyno sheets. Just subtract 15 HP/TQ
It will at least get you close and see the approximate curve. |
stock results vs SC results --- click on dyno results on the page from link - shows max tq 500 at 3800 rpms -
https://whipplesuperchargers.com/ind...product_id=149 |
Originally Posted by Pol83x
(Post 4493774)
Ok, I was looking to see a printout at rpm sheet or curve graph preferable between 3000-5000 every 100 rpm
Bob |
1 Attachment(s)
Only thing I got from Retter...
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Originally Posted by Knot 4 Me
(Post 4493985)
Only thing I got from Retter...
What exhaust? |
Originally Posted by Keith Atlanta
(Post 4494024)
Was that the Mag or HO?
What exhaust? |
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