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Detroit Diesel Tachometer Drive:
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Joined: 23 Dec 2020
Location: Utopia
Points: 2041 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Topic: Detroit Diesel Tachometer Drive:
    Posted: 13 Mar 2022 at 8:59pm
I have an old TLB with a Detroit 3-53 engine and it's tachometer is missing from the dash. I found the old cable jacket which drove this thing tucked behind the engine against the firewall. I cannot find where this originally connected onto the engine at. There is no drive assembly on either the camshaft, or balance shaft to connect the drive adapter to; only blanking covers. I've never seen them driven anyplace else myself and wondering if anyone else has?

Thanks,
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DMiller View Drop Down
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 31151 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 14 Mar 2022 at 3:55am
Has always been off a cam, engine likely replaced and the drive lost to time at some point as most don’t care when a gauge quits.

Nearly all DD cam gear ends have a drive spline or coupler capability on the old 53s. Just have to order new gaskets and pull covers to validate if still there and then order a tach drive cover from someone that still has one as no longer produced. After that os getting correct direction of rotation adaptor.
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Joined: 23 Dec 2020
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Points: 2041 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 14 Mar 2022 at 6:57am
Thanks. Hard to say about the engine as it's an older TLB. I've only seen the cable driven types driven from the cam, or balance shaft on the inline engines also but thought I'd ask. 

I installed a new alternator yesterday with an "R" terminal and planning to install an electronic tachometer to fill the hole in the dash.  
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Joined: 27 Mar 2011
Location: Shandon, CA
Points: 2165 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tad Wicks Quote  Post ReplyReply Direct Link To This Post Posted: 15 Mar 2022 at 10:47am
Be aware that drives and tachs come in different gear ratios.
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Joined: 23 Dec 2020
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Points: 2041 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 15 Mar 2022 at 6:42pm
Originally posted by Tad Wicks Tad Wicks wrote:

Be aware that drives and tachs come in different gear ratios.

Yes, and thank you. I have several of the 90 degree adapters with varying ratios, but didn't see a drive on this engine so figured I'd ask. 

I have ordered an alternator driven tachometer which should arrive next week. These are driven by the "R" terminal on the alternator rather than mechanically. 
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