harbor freight compression gauge

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Mar 10, 2008 | 04:20 PM

jhnlennon

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harbor freight compression gauge

okay so i bought a compression gauge from harbor freight part#93644 to use on my 87 6.9 and the adapter it comes with to go in the glow plug hole bottoms out before the treads contact. whats the deal? has anyone used this model before? the adapter has 10x1 threads and is about 2 inches long from tightening nut to bottom of adapter. the instructions say to use this adapter, is it the wrong one or is there carbon build up inside the glow plug holw? damn cheap tools!!

Mar 10, 2008 | 08:14 PM

fuzzy1626

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Joined: Feb 2007

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From: Taylorsville, NC

I remember someone saying you have to cut the adapter off right below the flare. Will that help it fit?

Mar 11, 2008 | 02:26 AM

jhnlennon

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that would cut off the one way valve that holds the pressure reading then. i dont understand why it wont fit the instructions say to use the adapter. anyone else use this adapter?

Mar 11, 2008 | 06:59 AM

PLC7.3

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Joined: Nov 2004

Posts: 5,638

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From: Manitoba

Quote:

that would cut off the one way valve that holds the pressure reading then

HUH....... there should be a pressure release valve on the hose end by the guage........ not the adapter.

Check out these adapters available.....
http://www.tooldesk.com/products/def...hString+Diesel
Snapon..... adapter
Description:
For GM 4.3L and 5.7L plus Navistar 6.9L and 7.3L diesel engines. Replacement valve core is M3545A4. Must be used in conjunction with MT33C Compression Gauge and M3569 or M3570 Quick Couplers.

http://buy1.snapon.com/catalog/item....re&dir=catalog

http://www.toolsource.com/diesel-ada...g-p-93010.html

Mar 11, 2008 | 10:29 AM

jhnlennon

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thats what mine looks like except about 3/4 of aninch longer. there is a schrader valve in the end of it that holds pressure and a release valve in by the gauge itself. if i cut it then i would cut off the schrader valve that actually hols pressure. looks like my adapter is too long?

Mar 11, 2008 | 11:48 AM

hselin

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Joined: Aug 2006

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From: Marina del rey/venice

Hello ,remove the valve to see if possibly to run a tap inside the adaptor ,that are the problem with cheap tools, but you are only used for a few times ,