3B valve stem seal replacement (pics!)

amaurer · 08-10-08, 04:30 PM

I *think* I've found the source of my occasional stink and oil loss. (see http://forum.ih8mud.com/diesel-tech-...l-mystery.html)

I don't see people talking about valve seals on 3B's much, but I found that 3 of them were loose, and 2 weren't even seated on the guides anymore, they were just floating up on the valve stem!!

Sadly, I couldn't get my hands on 8 seals, SOR only had 6 and I couldn't find ANY suppliers. I replaced 5, ruined one, and reused the tightest fitting of the old ones.

, I know.

Here are some pics, its an easy job...

#1 remove rocker cover and rocker ass'y.
#2 rig up a hose from your air compressor and set it to 90psi or so.
#3 i used a spare fitting from my compression tester set, if you do so, remember to drill out the schraeder valve inside it though.

amaurer · 08-10-08, 04:32 PM

#4 attach the compressor hose to your fitting with a clamp, and apply valve spring compressor
#5 tap the spring compressor to break the keepers loose and remove them
#6 remove the springs

amaurer · 08-10-08, 04:34 PM

#7 remove the old seal, just pull with a twist.
#8 install the new one. I used a socket to help push it down easily... they're TIGHT! so careful hammering is needed. I ended up ruining a seal by hammering it on cockeyed, beware!
#9 Voila! rinse, repeat.

gerg · 08-10-08, 05:09 PM

Thanks man I never thought of that as a potential problem. It is also comforting to know that I am not the only one with a disaster for a garage!

g

Diesel42 · 08-10-08, 07:05 PM

Another excellent tutorial.

lostmarbles · 08-10-08, 07:26 PM

Great work Drew. (I especially like the compressed air idea.)

amaurer · 08-11-08, 08:48 AM

Quote:

Originally Posted by gerg

Thanks man I never thought of that as a potential problem. It is also comforting to know that I am not the only one with a disaster for a garage!

g

I'm offended, thats the cleanest its ever been!!

BrianSanDiego · 08-30-08, 10:06 AM

Thanks a LOT for the writeup. I'm going to need to do this on mine soon and pics always help a lot!

mel lowe · 08-30-08, 03:35 PM

Any other sources for the seals?

I don't even want to look at mine w/o new ones in hand.

crushers · 08-30-08, 03:58 PM

nice write up...
thanks

RufusTheDufus · 09-02-08, 08:05 PM

What gap did you set the valves to cold? Is there a general rule of thumb on what the cold gap should be? I know that the valves supposed to be adjusted when the engine is at operating temp but there has to be some baseline that's used as an initial setting.

RufusTheDufus · 09-02-08, 09:08 PM

I found the answer in the FSM. (I should have checked there first.) The initial cold adjustment is the same as the hot.

goldchaser · 09-18-08, 06:04 AM

amaurer did this fix your oil usage problem,im doing my 12ht the same way tomorrow,ive got similar probs,good compression but chewing oil,keen to know how its going after you changed the seals

cheers goldchaser

amaurer · 09-18-08, 08:58 AM

Quote:

Originally Posted by goldchaser

amaurer did this fix your oil usage problem,im doing my 12ht the same way tomorrow,ive got similar probs,good compression but chewing oil,keen to know how its going after you changed the seals

cheers goldchaser

no.

Its not that they didn't need to be replaced, as it was clear my old ones were toast, it just sadly didn't fix it. I don't know if thats cuz i damaged some of the new seals putting them on, or, more likely, my problem is just elsewhere. sigh.