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  #1  
Old 10-07-2010, 10:03 PM
funola's Avatar
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Photo tach and cranking RPM

Harbor Freight has one for $39. I didn't feel like spending that much and found one on ebay for $12. It works by measuring the reflection of a laser beam off of a reflective tape that you glue onto whatever you are measuring. I put a square of the tape on the harmonic balancer and my idle was measured at 690 RPM. I also tried to measure the cranking RPM by disconnecting the glow plugs and cranking on a cold engine. It was hard to get a reading but I was able to get it just one time and it was 250 RPM. Is that too slow? There's a tip in the instructions for measuring low RPMs by putting 2 squares of the reflective tape 180 degree apart and dividing the result by 2. I am going to try that next.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
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Old 10-07-2010, 10:30 PM
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Would you mind posting a link of what you purchased? I would like to know the idle speed on my NA 617.
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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Old 10-08-2010, 08:08 AM
funola's Avatar
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Anyone know the spec for starter cranking RPM?

I actually paid $0.01 for the photo tach . The rest was shipping.

https://m.ebay.com/Member/G/ViewItem.aspx?aid=150493661192&emvcc=0

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
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