Help Identifying old Merc Drive
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Help Identifying old Merc Drive
I have a 1977 Thunderbird FC-20L with a Chevy 350. I've been told that I have a TR-II drive but also have been told that it is a TRS-II drive. I have never worked on a sterndrive boat before and don't know much about identifying them. I was wondering what people here would say I have and get a for sure answer.
Here are some pictures of the drive.
http://imgur.com/a/6m0ck
Here are some pictures of the drive.
http://imgur.com/a/6m0ck
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According to this chart (http://www.bluewatermarinesvc.com/pd...year_index.pdf) the serial number that is off the drive which is 4545516 shows up as a TRS 280. But I thought the TRS 280 was the powerdrive package and that outdrive was different from the powerdrive package or am I mistaken?
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The previous owner had a new prop sitting in the garage and it is a 15 1/4inch prop which makes me think that it is a TRS since the max prop is 16inches.
Last edited by EMTJEEP; 06-01-2015 at 08:24 PM.
#7
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It is a TRS, measure the prop hub diameter and check it against any other standard merc prop hub at the marina , if it is the same then TRS for sure as the TR had a larger bullet diameter and hub. Also the TR was a 2:1 ratio I think, that prop looks like a 17 or 19 pitch that would be way too small for a 2:1 on an F20 350 combo
Biggus is right on with the mercy tans too
Biggus is right on with the mercy tans too
Last edited by IRONMAN; 06-01-2015 at 09:33 PM. Reason: Add
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The problem is that the serial number on the drive and on the engine cover are both faded but the engine serial number is barely faded. So I can't tell if the second number is a 5 or a 6. Because if it is a 5 then that would mean it is a TRS but if it is 6 than it would be a TR.
BUP which list of serial numbers are looking at for reference? Because I have found some that say that the serial is a TR and others say it falls under a TRS.
BUP which list of serial numbers are looking at for reference? Because I have found some that say that the serial is a TR and others say it falls under a TRS.