confusion on evinrude model numbers and year

[osteospurnum]

I have just returned from ordering parts for what I thought was a 1971 40HP Big Twin.<br />I went in and gave the man my model Number 40102F<br />and serial B10268 the numbers for a 71 model and he brings up the relevant page on the computer and tells me there is no such model I either have a 40102G or a 40102B I say no I am sure its a 40102F I have just checked and it definately is so we look at pictures of water pumps (the item I need) for the G and the F and they are not the same.<br />So we look at 40 hp models from the previous year of 1970 and there is my pump and the thermostat I also need, for a totally different model number so I am very confused according to the parts lists my engine doesn't exist can any one identify the 40102F for me?<br />I can see ordering parts for this engine being a bit of a nightmare.<br />Thanks <br />Chris

 

[Hooty]

Re: confusion on evinrude model numbers and year

Is it possible that the midsection and lower unit have been changed? Is the model number off of the clamping bracket or the Welch plug on the engine?<br /><br />c/6<br /><br />Hooty

 

[clanton]

Re: confusion on evinrude model numbers and year

Look for a round plug on rear/side/top of engine block, looks like core plug, if this plug is there and has numbers. Do numbers match? Gear case could have been changed. The 1971 micro-catalog does not list suffix A thru G , only the model number.

 

[osteospurnum]

Re: confusion on evinrude model numbers and year

Thanks<br />I have just checked the Plug on the enginewhich I did think was a core plug and both it and the plate on engine mount both have 40102F.<br />Chris

 

[Bear]

Re: confusion on evinrude model numbers and year

1971 40 hp serial numbers:<br />40102<br />40103<br />40152<br />40153 <br /> 1971 40 hp Ski Twin picture <br /><br />I can't find a 1971 Big Twin here (click) <br /><br />That isn't much help, but I think Hooty and Clanton might be right about the lower unit.

 

[osteospurnum]

Re: confusion on evinrude model numbers and year

The Ski Twin In your brochure pic looks the same as my Big Twin.<br /><br />Any one have any idea what the suffix letters denote<br /><br />I should also point out that the Thermostat mounted on top of my block is not the same as the exploded 40102B/G illustration <br /><br />Chris

 

[alcan]

Re: confusion on evinrude model numbers and year

Hi Osteo<br /> I did a little research. I found no mention of a model with that sufix. This by no means says it dosn't exist. I could not find any 71 models that used a thermostat, and all used the same water pump,(w/single pipe #379741). I did find (as you note) in 1970 all 40hp models used pumpkit #381577 (double pipe) and also used t-stats. Now comes the interesting part. Is your motor a factory built model or did someone pieced it together? Are the two cooling pipes running up in the exhaust housing and do they work (hooked up)? The L/U could have been swaped, but then there is the case of the head,t-stat and cooling system.

 

[clanton]

Re: confusion on evinrude model numbers and year

I find a 1969 big twin 40 Hp that has a thermostat, model number starts with 40902R

 

[osteospurnum]

Re: confusion on evinrude model numbers and year

Hi again Alcan<br /><br />The pump kit I have just ordered is the 381577<br />which has a copper inlet to the pump housing and an outlet up the engine leg and another pipe (I don't know the purpose of) which goes the length of the mid section past the pump to a grommet at the bottom of the leg next to the bottom of the inlet pipe.<br /><br /> According to my manual there are two variation on the pump apparently an old version with two pipes rising from it and a newer version similar to mine with one pipe up and one down.<br /><br />There is nothing to indicate that the engine has been put together from bits however I don't have any history on it so don't know and as you say there is the top end having a Thermostat<br /><br />Chris

 

[alcan]

Re: confusion on evinrude model numbers and year

Hi Osteo <br /> Everything sounds to be in order. I don't think your motor is a patch-up either, I think it's stock. I don't know the reason for the differance. A guess, might be a commercial model or a model made in Europe,or made for export. Be sure and give your presure control valve a check. It sits under the t-stat. Put that puppy back together and have fun.

 

[osteospurnum]

Re: confusion on evinrude model numbers and year

Thanks guys.<br /><br />Any further info would be appreciated particulaly the correct method of synchronization for say earlier 40hp Twins for example 1970 models which appear to have more in common with my model.<br /><br />The 40102 synchronisation technique according to my manual is to have the carb start to open as the mark on the cam passes the pointer on the inlet area hopefully it is the same for the older units<br /><br />Chris

 

[alcan]

Re: confusion on evinrude model numbers and year

Yes you are correct.