If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Carby bearings
I,ve noticed that now I have to fairly regularly work a bit of oil into the
choke pivots or the chokes seize up on my T3. About every 6 months, not a big deal. Just get some light oil on pivot near where it enters body of carby and wriggle things for a few minutes. Never happened when I used leaded petrol oddly. Another side effect ? Or maybe just the original lubricant has vanished. No noticeable play in shafts. John |
Ads |
#2
|
|||
|
|||
Carby bearings
John wrote:
> I,ve noticed that now I have to fairly regularly work a bit of oil into the > choke pivots or the chokes seize up on my T3. About every 6 months, not a > big deal. Just get some light oil on pivot near where it enters body of > carby and wriggle things for a few minutes. Never happened when I used > leaded petrol oddly. > Another side effect ? Or maybe just the original lubricant has vanished. > No noticeable play in shafts. Maybe it's residue from the oiling that's gumming up the works. I'd be inclined to dissolve the residues away and clean the area up with carby cleaner, and just leave it dry to see how that goes. John |
#3
|
|||
|
|||
Carby bearings
That,s a point. I,m overhauling my spare set of carbs so I,ll complete that
and change over. Just talking to people, wandering around the net you hear that unleaded petrol being accused of just about everything. Wondered if different vapour point was washing out oil. John "John Henderson" > wrote in message ... > John wrote: > >> I,ve noticed that now I have to fairly regularly work a bit of oil into >> the >> choke pivots or the chokes seize up on my T3. About every 6 months, not a >> big deal. Just get some light oil on pivot near where it enters body of >> carby and wriggle things for a few minutes. Never happened when I used >> leaded petrol oddly. >> Another side effect ? Or maybe just the original lubricant has >> vanished. >> No noticeable play in shafts. > > Maybe it's residue from the oiling that's gumming up the works. > > I'd be inclined to dissolve the residues away and clean the area > up with carby cleaner, and just leave it dry to see how that > goes. > > John |
#4
|
|||
|
|||
Carby bearings
On 10/03/11 09:45, John wrote:
> That,s a point. I,m overhauling my spare set of carbs so I,ll complete that > and change over. Just talking to people, wandering around the net you hear > that unleaded petrol being accused of just about everything. Wondered if > different vapour point was washing out oil. Many bearings and axles ( like gas flap axle) are originally desiged to be lubricated by small amount of lead in fuel. (Like valve stems and valves.) It's very minimal lubrication but remove that and you might get problems in vehicles which stand still long times. "Dry" fuel is always a problem in vehicles designed for fuel which includes (at least some) lubricants, applies to ethanol too. Probably not as large as some think, nowadays. More like minor annoyance. Gasoline additive (lead substitution) might help but it's not cheap. If I recall right VW used valves and valve stems suitable for unleaded fuel in all models from somewhere in the latter half of the 60s. (1968?) I tried to confirm this but quick googling didn't unfortunately find anything reliable. I'm quite sure that this matter has been discussed here earlier, too, but I don't recall the results. -- Tuomas - VWs:'63 typ14, '65 typ34 & '61 typ2 |
#5
|
|||
|
|||
Carby bearings
Tuomas wrote:
> Many bearings and axles ( like gas flap axle) are originally desiged to be > lubricated by small amount of lead in fuel. (Like valve stems and valves.) > > It's very minimal lubrication but remove that and you might get problems in > vehicles which stand still long times. > > "Dry" fuel is always a problem in vehicles designed for fuel which includes > (at least some) lubricants, applies to ethanol too. As far as I know, the idea that tetraethyl lead is a lubricant is an urban myth. It decomposes in the heat of combustion, releasing metallic lead. This coats things in the combustion chamber and exhaust system. Lead does not lubricate valves, it cushions the valve seat against impact by the valve itself. Otherwise that impact can result in valve seat recession. > Probably not as large as some think, nowadays. More like minor annoyance. > > Gasoline additive (lead substitution) might help but it's not cheap. > > If I recall right VW used valves and valve stems suitable for unleaded fuel > in all models from somewhere in the latter half of the 60s. (1968?) I tried > to confirm this but quick googling didn't unfortunately find anything reliable. IIRC (I worked for VW Australia at the time), initially engines with hardened valve seats were marked by blue paint dots on the cylinder heads. I don't remember the year, but 1971 rings a bell. It may have been one or two years earlier. I don't believe any other modifications were made to accommodate unleaded fuel. > I'm quite sure that this matter has been discussed here earlier, too, but I > don't recall the results. John |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
When Does Alternator Bearings and A/C Bearings Go Bad?? | Vmusic | Honda | 4 | August 21st 09 04:06 AM |
T3 Carby Idling Shut off | John[_28_] | VW air cooled | 5 | January 22nd 09 02:08 PM |
Carby Overhaul | John[_28_] | VW air cooled | 2 | August 25th 08 10:21 AM |
Wheel Bearings? | Scott Hurst via CarKB.com | Ford Explorer | 7 | January 29th 06 11:45 AM |
Carby Jet Removal | hemyd | Technology | 3 | January 26th 05 01:15 AM |