I just arrived home after a short drive of maybe 15-20kms. As I was driving along, the engine started running rough and would actually stop if I put it in neutral while coasting. When I got home, it sounded like a boiling noise in the engine and wasn't sure if it is the oil or if it was fuel in the carby making the noise. No warning lights came on or anything to show a problem other than the rough engine feel.
This is a standard 1600 mexi beetle engine with a standard 34 pict carby and the temp outside was about 22 degrees if that makes any difference.
Has anyone experienced this before?
Yogie
was your float valve stuck? flooding the engine?
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
Boiling point of oil is over 250 celcius so I doubt its that 😂
The answer is yes, you can boil the oil - I've done just that. This happened at Amaroo Park once when the fan belt broke, and I didn't see the gen.light on. The engine got so hot that the cylinder studs went blue. There was a lot of popping and back-firing, because the rockers started to seize, and when I stopped in the pits we could hear the oil boiling! Luckily there was no major damage. Having said that, the engine would have to get bloody hot, as Simon said, over 250C, for the oil to boil. The oil in my engine at the time was very good quality, which probably prevented major damage.
Cheers, Greg
I'd rather wear a Beetle out by racing it than by polishing it!
Anthiron wrote:was your float valve stuck? flooding the engine?
I haven't checked but would that make a boiling noise?
One other thing, I did just fill up with fuel. If there was any water or other crap in it, could that be making the noise?
The engine was hot but the engine lid wasn't any hotter than normal.
Yogie
One quick way to tell if it is really hot is spit on your finger and see if it sizzles when you touch the crank-case.
I'd rather wear a Beetle out by racing it than by polishing it!
if it was that hot though to boil oil, surely it would have been pinging off its tits before it even reached that stage!!
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears. 👍
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta!
I have had the oil blow white smoke out of every nook and cranny when i was driving at 120 on a 47C day :P ahh the memories... And she didnt want to drive too well when it was that hot.
how did it run when cool was it still closing down when trying to idel and is the gearbox oil at correct level
👍👍😂🙅🥷😬🤓
It was running fine when cool (and up until the last 5kms of my trip). Not sure about gearbox oil but motor oil level is fine.
Does Your engine have a thermostat??
as Mexican thermostats when they fail they stay closed...
whereas the German ones used to stay open....
check Your Fan to see that its still connected and hasn't broken off...
also the alternator pulley to make sure it hasn't broken in the center weld....
the bottom pulley has a woodruff key to hold it to the crankshaft.. if this is broken or missing the pulley could spin on the crankshaft....
other than those things which would make your engine overheat....
its unlikely that the oil was actually boiling..
although it can get VERY HOT...
If Your carby needle and seat were stuck open then Your engine would be getting flooded... and would stop...
and could be spitting fuel into the inlet manifold....
this is a common occurence....
especially with electric fuel pumps....
LEE
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---
Yogie wrote:Anthiron wrote:was your float valve stuck? flooding the engine?
I haven't checked but would that make a boiling noise?
One other thing, I did just fill up with fuel. If there was any water or other crap in it, could that be making the noise?
The engine was hot but the engine lid wasn't any hotter than normal.
Yogie
yes, it can make a similar sound if there are great gulps of fuel dropping down into the manifold. sounds like your symptoms too.
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
