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#1
12-10-2010, 01:56 PM
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Expansion Tank Cap Replacement Interval
Does anyone, from experience, have a sense of how often the expansion tank cap ought to be replaced? Mine looks to be in good shape. But, as I'm trying to figure out why my coolant level is dropping and as it's been seven years and 85,000 miles since it was last replaced, am I overdue?
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles 06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
12-10-2010, 02:07 PM
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I don't think there is really a time limit on these sorts of things - to test your coolant system properly you need to do a pressure test. However to just check the cap I'd wrap some bog roll / toilet roll / loo roll round the cap and see if it gets wet.
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#3
12-10-2010, 02:23 PM
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Answer
Quote:
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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#4
12-10-2010, 08:15 PM
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Quote:
It sounds like a good idea. Must try it some time. 
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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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#6
12-11-2010, 05:55 AM
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Quote:
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles 06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#7
12-11-2010, 07:10 AM
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Mine was leaking. There are these big brass washers (shims) on the underside of the cap looking into the cap. Mine were cracked, hairline and hard to see. I'd only change a cap if it was faulty, which mine was. I got mine from Phil. I think it is a 130C cap.
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1982 300SD
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