Diesel 'Crush Test' - SailNet Community
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post #1 of 20 Old 11-19-2010 Thread Starter
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Diesel 'Crush Test'

So..how many of the diesel 'dorks' know what a 'Crush Test' is and what it's used for..??
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post #2 of 20 Old 11-19-2010
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From what I've managed to google-fu, it's to ensure that everything's seated correctly on a crush-type washer. I'd guess you tighten everything up, then remove it again and check the crush pattern.

I'm seeing a bunch of stuff like "repeat injector copper washer crush test to verify correct crush pattern."

I'd probably wait for a real diesel geek to show up and give us the what-for, though.
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post #3 of 20 Old 11-19-2010
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Sitting on the captain's lap?

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post #4 of 20 Old 11-19-2010
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The diesel crush test is when you crawl under the engine and then wiggle it to see if the engine mounts are secure.

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post #5 of 20 Old 11-19-2010
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I've not heard that term before. There was a product called plastiguage that was crushed between the crankshaft and bearing to indicate the clearance between the two, but that product wasn't specific to diesel motors.

Ray
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Boating for over 25 years, some of them successfully.
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post #6 of 20 Old 11-19-2010
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Is this engine specific or general for any engine? I've never heard the term either.

Deutz air cooled diesels required a piece of solid core lead solder to be crushed between the head and piston after the head is bolted on, then it's removed and miked to see the clearance since it doesn't use a head gasket. The cylinder to head seat carbon seals itself like an old VW engine. (A few others also use that method)

added;
Pencil type injectors (cat/perkins etc.) also have a crush washer on the face seat to seal them and it could refer to that.

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Last edited by MacGyverRI; 11-19-2010 at 11:41 AM.
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post #7 of 20 Old 11-19-2010 Thread Starter
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Hint..Mack Boring and my yard performed this 'Test' on my ailing 3GM30F...
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post #8 of 20 Old 11-19-2010
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Crush washers I've heard of.
The plastiguage stuff Erps mentioned I've heard of.
Crush test - no clue.

John
SV Laurie Anne

1988 Brewer 40 Pilothouse

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Hates tests

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post #10 of 20 Old 11-20-2010
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as a retired shipwright that owns 4 road diesels the only diesel specific crush test i know is to torque the injectors and then inspect the crush pattern on the copper washers. there are other crush tests however none are specific to diesel.

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