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Tach on a diesel

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Brad in WI

01-31-2006 01:42:57

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On my MD, I want to install a tachometer. Or at least be able to check the RPM's now. When I have it at full throttle with no load it only sounds like it is running at 1000 RPMs or so. Well below the amount of 1495 RPMs on the Serial Number tag. Can anyone help me or give me some good products and knowledge to make my job of researching millions of products to a select few that may actually work. Thanks a bunch guys.
Brad

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Wardner

01-31-2006 03:35:08

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Re: Tach on a diesel in reply to Brad in WI, 01-31-2006 01:42:57

You could also use a Stewart-Warner hand-held mechanical tach. They work in either direction. Place it on the end of the PTO shaft and read the number. You will have to multiply that by the ratio of your constant mesh gears in the tranny. The ratio can be calculated from the number of teeth on both gears. The teeth count will be listed in your parts book.

Harmonic tachs are also available. They are placed against the block and are accurate. I have seen them used several times. I believe they are cheap.

For a permanent installation, I would probably get the tach and tach drive from a SMD, 400D, or 450D just to keep things kinda original. The tach drive is part of the distributer and cannot be separated.

If you don't want to do any of this, have someone follow you down the road while you are in fifth gear. The chase car should be doing 16 mph when your throttle is fully open.

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Bob

01-31-2006 02:56:18

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Re: Tach on a diesel in reply to Brad in WI, 01-31-2006 01:42:57

For troubleshooting use, you could get a photo tach.

Link

For permanent installation, you could get a Stewart Warner or ISSPRO tach that uses a magnetic probe inserted in the flywheel housing to "count" the teeth on the ring gear as they pass.

Link

If you have an alternator installed, there or other tachs that can run off of the AC signal from the alternator stator.

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Brad in WI

01-31-2006 09:56:28

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Re: Tach on a diesel in reply to Bob, 01-31-2006 02:56:18

I do have an alternator installed. I did a little research online last night and was wondering how difficult it is to wire in one of those types. and also how accurate it is. Brad

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Bob

01-31-2006 10:02:08

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Re: Tach on a diesel in reply to Brad in WI, 01-31-2006 09:56:28

The tach needs 1 power wire, 1 ground, and 1 wire from one of the 3 alternator stator leads.

Some alternators have the stator connection available, others do not.

It can be added to ANY alternator simply by attaching a lead to one of the stator terminals, and bringing it outside the case.

If the belt and pulleys are in good shape (not slipping) and you get it calibrated correctly, it should be fairly accurate. Anyhow, it was accurate enough for many OEM setups.

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Brad in WI

01-31-2006 10:33:07

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Re: Tach on a diesel in reply to Bob, 01-31-2006 10:02:08

Thanks Bob I will go and look into the tach that reads off of the alternator. I just didn't know if anybody knew anything about them or not.
Brad

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