Does BD attack Viton?

[marki Senior Member Find all posts View Profile Close marki]

Just went through my second set of fuel pump seals in about three months (1990 Series 80 1HZ). Last time they were replaced, the original rubber seals were replaced with Viton. I thought bio didn't attack Viton...

[Matt Senior Member Find all posts View Profile Close Matt]

Re: Does BD attack Viton?

Not that I know of, it is specifically designed and used for materials like B100.

Matt

PS ask for Bosch Viton selas for the 1Hz make sure they are not Toyota rubber ones, which was done to my 1 Hz. If the seals are gone again its going to be rubber ones.

[Sauman Senior Member Find all posts View Profile Close Sauman]

Re: Does BD attack Viton?

BD does not (ed:joe) attack Viton.But if traces of Meoh is left ,then viton will be attacked.
In this scenario the best option is to go for EPDM seals.Aflas will alos do the trick but may be expensive.
EPDM is cheaper then viton by the way so dont let the garage full you for a few more dollars.
Cheers
Sauman

[Sauman Senior Member Find all posts View Profile Close Sauman]

Re: Does BD attack Viton?

Meant to say
BD does not attack Viton!!!
Sorry abt the typo.
Cheers
Sauman
Technically BD does not attack anything till about 6 months of storage .Lot of work is going on in this matter of storage and material compatability.

[marki Senior Member Find all posts View Profile Close marki]

Re: Does BD attack Viton?

It now appears that the seals that have failed are, in fact, rubber. Do Viton seal kits for 1HZ fuel pumps come as a kit, or do I have to take the seals in somewhere and get them matched individually?

[Matt Senior Member Find all posts View Profile Close Matt]

Re: Does BD attack Viton?

Bosch seal kit, ask the mechanic to get this, confirm it with the supplier and you confirm it with him. I had mine replaced with rubber just like you, this is what Toyota supplies, rubber!

An aftermarket Bosch fuel injection centre will have the kit.

Matt

[Murphy2000 Junior Member Find all posts View Profile Close Murphy2000]

Re: Does BD attack Viton?

Viton works for biodiesel but there are a few vegetable oil types that will attack it.

Most of the common veg oils are ok with viton but a few of the less popular plant oils will chew it up..

Why does palm oil come to mind? Or maybe it was olive oil.. I forget..

[gwalker Senior Member Find all posts View Profile Close gwalker]

Re: Does BD attack Viton?

Viton works for biodiesel but there are a few vegetable oil types that will attack it.

Most of the common veg oils are ok with viton but a few of the less popular plant oils will chew it up..

Why does palm oil come to mind? Or maybe it was olive oil.. I forget..

I'm chemically challenged and I thought that once any vegetable oil was processed into biodiesel, the result was the same no mater what the starting VO.
Are you saying 'All biodiesels ain't biodiesel'? and are chemically different?
If so, then some must be better than others and should perform better than others. Has any work been done on this to rate the biodiesel produced from different oils?
George

[marki Senior Member Find all posts View Profile Close marki]

Re: Does BD attack Viton?

I'm chemically challenged and I thought that once any vegetable oil was processed into biodiesel, the result was the same no mater what the starting VO.
Are you saying 'All biodiesels ain't biodiesel'? and are chemically different?
If so, then some must be better than others and should perform better than others. Has any work been done on this to rate the biodiesel produced from different oils?
George

Thay are all methyl esters (or ethyl esters if you use ethanol), but the hydrocarbon chain varies from feedstock to feedstock - and yes - some ought to burn differently from others - this would yield a different cetane rating...

On fuel pump seals, it turns out mine is Denso, not a Bosch, and Bosch don't make kits for Denso.

I am chasing up a specialist o-ring supplier. Will post details when I have them - and I'm going to go for Kelrez o-rings - even more resilient than Viton

(1990 80 1HZ)

[Matt Senior Member Find all posts View Profile Close Matt]

Re: Does BD attack Viton?

A bit late in replying but I will set the record straight for all to see. Toyota sell rubber seals for their Bosch VE rotary pumps that are definately installed on the diesel 1Hz. There IS an afternarket viton seal kit available for them, I know I had to do my 93 1Hz after two sets of rubber seals.

So there you have it.

Regards,
Matt

[TroyH Senior Member Find all posts View Profile Close TroyH]

Re: Does BD attack Viton?

BD does not (ed:joe) attack Viton.But if traces of Meoh is left ,then viton will be attacked.
In this scenario the best option is to go for EPDM seals.Aflas will alos do the trick but may be expensive.
EPDM is cheaper then viton by the way so dont let the garage full you for a few more dollars.
Cheers
Sauman

The PDL Chemical Resistance Handbook Vol II (Thermoplastic Elastomers, Thermosets and Rubbers) would suggest otherwise.

It rates resistance of FFKM Fluoroelastomer to Methanol as 9 (the highest rating) for 7 days at 23 degrees, and 8 at elevated temperatures indefinately. The material tested as a standard is DuPont Kalrez, and I quote as Resistance Note "little/no effect, severe conditions may cause slight swelling/property loss"

It also shows high resistance (PDL 8) to Lye, Fatty acids, vegetable oils, and methyl oleate and ethyl stearate (two 'biodiesel esters').

DuPont indicate Kalrez is slightly more resistant to oils than Viton.



Is it genuine viton? Is there a possibility there is anything else causing the problem?

[hdj80 Senior Member Find all posts View Profile Close hdj80]

Re: Does BD attack Viton?

My understanding was that all replacement seals should not be rubber....Because ULSD distroy's rubber. I got my seals replaced with vitron seals before I started making/using BD because ULSD distroyed them causing massive fuel leakage.
ULSD distroy's rubber differently than BD as ULSD hardens the rubber where as BD decay's it....I think?????

[Liz P. Biofuels Forum Newbie Find all posts View Profile Close Liz P.]

what fuel hose should I tell my mechanic

Hi Folks, sorry I'm continuing my saga of being a mechanically illiterate dumb girl, but I've carefully been reading through these posts to try and figure out what to tell my mechanic to do when I take the Merc240D in tomorrow. I just changed the inline filter and realised the hose it goes into is corroding away (is what I call a hose what you guys call a seal? it's got the metal ring thing around it with the screw to tighten and loosen).
So, do I say "Joe, I need a ------" insert in gap one of the following: vitron seal, solenoid seal, epdm seal, aflas seal, elaflex biodiesel hose, or something else entirely? And is there anything else I should ask him to check for corrosion or whatever else while I'm there? Thanks in advance. I'd be lost without this forum. Cheers, Liz

[Captain Echidna Senior Member Find all posts View Profile Close Captain Echidna]

Re: Does BD attack Viton?

Nah a seal is a smal part, often looks like flat pieces of rubber like material, some times they look like rubber O's (hence the name O rings) that are put in between bits of metal that make up the injector pump (metal screwed together generally leaks, unless they have something soft between them, like rubber)

I think what you are talking about is generally called a hose, it is a long tube with a hose clamp (the metal ring with the bolt in it that you do up to stop it leaking) at each end. These are on the outside of the engine.

Lots of modern hoses I belive are OK, you can viton ones, but they are expensive. So long as its not natural rubber (and you can tell if it looks like its been in the shop for 40 years since they last were popular) a normal hose should last a fair while (I am prepared to be corrected on this)

I am sure its cheaper to buy normal hose for the outside of the injector pump and replace it often, as you can do it yourself (even if only learning) As to pull the injector pump costs a lot of money in labour, more expensive seals are money well spent genneraly.

I love questions I can answer, so ask anything you may think is silly for being easy!

[brisvegas27 Biofuels Forum Newbie Find all posts View Profile Close brisvegas27]

Re: Does BD attack Viton?

Traditionally viton and nitrile have been the best in terms of resistance to fuels, however biodiesel blends have shown to be more aggresive in rubber degradation and most rubber manufacturers (hose), have been testing their products against these new biodiesel blends.
Goodyear Engineered Products, as far as I know are the only manufacturer to offer a specific product for biodiesel. Unfortunately at this stage it's only in industrial form for tank truck and in plant transfer. Naturally they will develop products to service the automotive hose segment in the future.