So. I would LIKE to do a citrus flush since there is so much crap and scale in the system. BUT! I repaired a pin-hole in the water pump housing with JB weld. It's a tiny hole (pin-sized even) and I repaired it on the inside and outside (both sides of the hole...).

Will a citric acid flush undo my repair? Whaddaya think?


(If you've been following my saga - and I can't imagine you have - then rest assured that I plan on flushing after chasing down my other issues)

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Cam
1982 240d

I don't think the mild citric acid would even touch the JB Weld.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

see my post on using a Prestone backflush kit, mercedes citric flush along with Shout Ultra Gel in order to REALLY flush the bad stuff out. even after performing multiple Prestone back flushes using a garden hose, the mercedes citric flush followed by using Shout Ultra Gel flush followed by yet another Prestone back flush, I STILL have some rust showing in the system! I'm planning on redoing this regiment again next year.......

That JB Weld is really tough stuff. I haven't found anything that will get to it except a grinding tool. I don't think you have to worry.

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Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!

The JB Weld will be OK but it is the Metal.
However, if the metal around the JB Weld was corroded and the JB Weld was put over it there is a small chance th aid could eat under the JB Weld.
Since both sides are patched I doube if there would be an issue. After the flush just keep an eye on the area for a month or two.

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84 300D, 82 Volvo 244Gl Diesel

If the space shuttle's styrofoam tiles were held in place with JB Weld, there wouldn't be any missing tiles on the shuttles.

That JB Weld is some bad a$$ stuff!

J B is an epoxy based material. It takes something much stronger than citric acid to hurt it. You will have no radiator core left long before the J B fails. Probably you have many other weak spots on the radiator core that will fail. Can you flush it with the radiator out?

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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

Also consider that you may discover weak spots in the heater core!

Happy Motoring, Mark

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DrDKW