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#1
10-19-2010, 03:01 PM
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my compression numbers :)
om 607960 6 cyl turbo 1987
#1 300 #2 340 #3 300 #4 320 #5 340 #6 345 #3 was kind of slow to build the test was done cold, engine runs fine but starting is another issue, unlike my hyundai diesel which starts one crank sometimes (indirect also) the engine smokes a bit at idle white smoke, the valve cover tube is broken and if i plug it with my finger it builds pressure rather quickly havent done a leak down as yet but i have found that soaking injectors in vinegar brings them to a brand new finish. how are my numbers anyone know the size of the tool for that funny shapped star head bolt? 
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#2
10-19-2010, 03:08 PM
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you have a range of 45 psi, which is too much...
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#4
10-19-2010, 04:54 PM
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No point, your range is waaay out of spec, it's spanner time, let the dog see the rabbit...
The ONLY check to make first is pop the rocker cover and make sure all the tappets have some clearance. Assuming 15 psi is atmospheric, 300 psi is theoretical 20:1 CR, and 345 psi is theoretical 23:1 So #1 and #3 are buggered and #4 is borderline. It's spanner time.
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#5
10-19-2010, 04:59 PM
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Actually, BEFORE you get the spanners out, get some very soapy water and spray it over the glow plugs and injectors and crank the engine, any leaks will blow bubbles, no bubbles = no leaks so check the valves have some clearance and if they do get the spanners out.
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#6
10-19-2010, 06:24 PM
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Quote:
actually i remember seing bubbles being blown on one of the glow plugs, i think i had wd40 sprayed on it, i didnt bother to check the others whats the remedy for leaky glow plug threads? 
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#7
10-19-2010, 07:12 PM
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Quote:
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#8
10-19-2010, 07:45 PM
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You need to have done the compression test with a warm motor. I would redo after a good run.
__________________
Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort....  1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles  1987 250td 160k miles English import  2001 jeep turbo diesel 130k miles  1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#11
10-20-2010, 07:28 AM
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Quote:
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#12
10-20-2010, 08:49 AM
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as difficult as it is on the 603, (not 607 like you stated above...) you need to redo the test with the engine warm before condemning the motor...
the star bolts are "tripple square" 12mm last I checked.
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#13
10-20-2010, 12:40 PM
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OK, hostage to fortune time.
In another thread I said that hot compression tests are a waste of time, all you need is a cold dry test, a cold wet test (one squirt of lube oil from oil can prior to inserting compression test nozzle) and if you want to be anal a blow down test at two crank positions with a regulated 10 psi supply. Hostage to fortune because matey has his cold dry numbers. If he now does cold wet and publishes the numbers, and then warm (warm always dry, never wet) you'll see..... Precisely how anyone hopes that a 45 psi disparity on two cylinders is going to go away on a hot engine test and give six near as dammit identical results is an exercise for the reader to speculate on.
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