Hi volks. This has probably been explored somewhere already but before I search out and buy something unnecessary... again; has anyone had any joy replacing the standard issue pushrod seals with silicone ones? I've not investigated it in depth but can see some for a 1600. I'm looking for my Type 4. Also saw some silicone rocker cover ones somewhere too but it escapes me as to where... Thoughts on whether any of the above are a worthy ungrade or should I stick a bit of gasket seal on my existing ones and stop finding new ways to spend money I don't have. Cheers! Sent from my SM-G950F using Tapatalk
The black and green pushrod tube O-rings should work fine. Cleanliness is critical, no old sealant or scratches in the head or case or tubes. And don’t use sealant on the O-rings. Silicone rocker cover gaskets are a worthwhile replacement IMO. https://www.customandcommercial.com...one_rocker_cover_gaskets_1700cc-2000cc_36575/
If you want silicone O-rings most seal suppliers such as Ashton Seals and Eastern Seals should be able to supply them, just select the size you need, or they’re available from Aircooled.net but delivery charges to the UK will probably be high. Small, case end: http://vwparts.aircooled.net/Silicone-Push-Rod-Tube-Seal-Type-4-021-109-345AV-p/021-109-345av.htm Large, head end: http://vwparts.aircooled.net/Silicone-Push-Rod-Tube-Seal-Type-4-021-109-349BV-p/021-109-349bv.htm
Is it silicone rings you want especially? A lot of us go for Viton rings - people like Polymax supply them. You might have to buy twice as many as you need but they’re still dirt cheap, compared to aircooled specialists.
Interested in getting some of the Viton rings. Anyone who's orderedt these before got the dimensions for them to hand, specifically the smaller inner ones (they seem to be the ones that leak most?) I have it that is is 21.3mm, but I don't know if that is ID or OD, and I need ID for the polymax site. Also the cross-section in mm too.
Not specifically interested in silicone, just less leaky. Thanks for the tip! Sent from my SM-G950F using Tapatalk
What I ordered was 24.99 ID x 3.53 CS, and 21.82 ID x 3.53 CS. I don’t think it matters what colour they are; I’ve got brown ones. I don’t know where these figures come from, but I asked on here whether anybody could confirm these, but didn’t get a response. However they are working fine. I had to order 16 of each, so they’ll probably see me out.
Some great recommendations here - I'm book marking this page. @Chrisd - worth looking at for the great oil leak elimination task....
For anyone thinking Silicone will cure their oil leaks bear in mind Silicone O-rings are relatively easy to damage during installation. I have seen it recommended to use a broom handle and a hammer to push the pushrod tube into position – do this with Silicone O-rings and the chances are it will leak. Use a suitable lubricant and gently push the tube into position, force should not be necessary but constant pressure is required to overcome the ‘spring’ of the O-ring otherwise the tube will pop out, and gently twisting the tube while pushing can help the O-rings seat. Leave the hammer in the tool box. Apologies if this is teaching your grandmother to suck eggs.
Far from it. Always good to hear how to do things the right way... especially given how often I've been advised incorrectly or just botched it completely. Insider knowledge on the nuances of these machines are exactly why we're here. Sent from my SM-G950F using Tapatalk
Cheers for the info, just been on the Polymax site but the specification is bewildering - what spec is best?
Ignore the colour; this is only to help sort sizes out. 75 ShA is what I’ve got - this is a hardness rating. I’ve had mine 3 years and they’ve been fine. Mine’s a type 4 engine BTW.
I remember buying a bag of type-4 o-rings to save cash when I did this a lot. How smug I felt - Viton - check, size measured and ready to go. Get to the crunch and it's "what kind of viton would that be sir?" Damn - I didn't know there were many different specs for Viton. lol
ORings can be a minefield . The Type 4 head orings are a non standard size so anything you buy will be the closest ..(unless the proper green and black ones ) Also if you buy cheap you will get issues … and the tolerance on any ORings are +/- 10% .I think the green ones are Aircon ones that are a higher temp related ..Take in to account different Shore specs and I’d buy the green and black ones from a Type 4 supplier
If the metal surface is undamaged then lubricating seals so they slide into place is best. It beats making them sticky so they hang up or having lumps of sealant making gaps. If somebody used silicone its all got to come off or little bits of cured silicone on the mating surface of the metal will prevent the seal making even contact with the metal so it will leak. Clean smooth metal surface, small amount of oil. Rely only on the springiness of the seal to work.. the twisting gently helps relieve the uneven pressure of a seal not going in 100% straight.
Its always the ones on 1 & 2 that leak, the last time I just used oil but they were supplier bought o rings and probably not Viton.
