84 & 85 300D. What is the recommended interval for replacing the secondary, spin-on fuel filter? 3000 miles or when you start noticing loss of power, whichever comes first?

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the sooner you start... the sooner you'll get done If it ain't broke, don't fix it.. Its always simpler to tell the truth...
2007 Honda Accord EX
2007 Honda Accord SE V6
96 C220
97 Explorer - Found Another Home
2000 Honda Accord V6 - Found Another Home
85 300D - Found Another Home
84 300D - Found Another Home
80 300TD - Found Another Home
Previous cars:
96 Caravan
87 Camry
84 Cressida
82 Vanagon
80 Fiesta
78 Nova
Ford Cortina
Opel Kadet
68 Kombi
Contessa

I think the recommended interval is 30,000 miles, however, in practice, they need to be changed only when they start affecting the power. After you "feel" the power loss due to a clogged filter once, you will know how it feels. Always carry spares, you never know when you may need one.

Got about 40k out of my last one.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

3000 is way too soon. I'd go with Craig and say 30,000miles or when it starts to affect power.

what about the other filter, the small white one?

The same. It's even more easy because it's clear so you can see when it's clogged.

depends on what you run for fuel. I run veggy, so I carry spares with. Iv'e gotten from 1500- over 5k on them. the present one is around 5k right now, and no indications of clogging.

and I carry a full can of sea-foam, or a qt of tranny fluid to fill the filter with,(smoke screen!) as well as a wrench for it and a screwdriver for the inline.

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

Just wondering because I seem to be not getting as much umph on my 85 as I did this summer when I changed the filter and I don't think I have even 5k on it. Does lack of valve adjustment affect the performance too?

Not sure if valve has aver been adjusted on this car. What was the interval for adjustment again?

__________________
the sooner you start... the sooner you'll get done If it ain't broke, don't fix it.. Its always simpler to tell the truth...
2007 Honda Accord EX
2007 Honda Accord SE V6
96 C220
97 Explorer - Found Another Home
2000 Honda Accord V6 - Found Another Home
85 300D - Found Another Home
84 300D - Found Another Home
80 300TD - Found Another Home
Previous cars:
96 Caravan
87 Camry
84 Cressida
82 Vanagon
80 Fiesta
78 Nova
Ford Cortina
Opel Kadet
68 Kombi
Contessa

When I adjusted my valves on my new-to-me 300cd, it smoothed out the idle and increased performance quite a bit. While you are at it, with the valve cover off and all you can measure the chain stretch. This will give you a very good idea of how worn the rest of the engine is. I believe chain stretch can be compensated for with offset woodruff keys up to about 10*. I had planned on replacing my chain (expecting the worst) but found to my glee that it was only stretched barely 2*. There were stickys with links to wonderful explanations and pix of a whole bunch of maintenance procedures at the top of this forum but I have no idea where they went! Anyone know what happened to all that info?

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Thanx,
Alberta Luthier
1983 300CD ('Stinky')155k miles, 2.47 diff, EGR removed, AAZ injectors with 265 nozzles from Sean,and vogtland lowering springs.
1984 300SD ('Old Blue')150k Klicks from Japan originally, came with rear head rests, no sunroof and never had an EGR

15,000 or one year.