The Stupid Question Thread

[khalimadeath]

On most vehicles you would weld it on the downpipe after the headers join.. These exhausts don't lend themselves to 02 sensors well.
_________________
The United States Constitution
(c) 1787. All Rights Reserved


1970 Bus Westfalia
1964 Kombi

[busdaddy]

I'd go as close to the muffler as possible to prevent skewed readings from reversion, maybe pointing straight back?
_________________
Rust NEVER sleeps and stock never goes out of style.

Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!

Слава Україні!

[Wildthings]

[sestino]

RE: Is this a good place to weld the bung for my O2 sensor?

Thanks for the advice. I'll try to get it welded closer to the muffler and further away from the exhaust tip.

Wildthings, what are the snap on shields you refer to?

The Innovate instructions (pasted below) also say to have the sensor 24 inches down the header (in a typical application), and they say that the overly lean readings with shorty headers occur at low speeds:

2.3 Sensor Placement
Optimum bung placement will vary from application to application, but using the guideline below will ensure the longest sensor life with the most accurate readings. Using a bung is the preferred method for mounting the oxygen sensor in all applications.

Weld the bung at least 24 inches downstream of the exhaust port
outlet (after the collector), or 24 inches after the turbocharger if so
equipped. The bung should be welded before the X or H pipe if so
equipped.

Using a clock as reference, mount the bung between the 9:00
o’clock and 3:00 o’clock position. Welding the bung in the lower
section of the exhaust pipe can result in sensor damage caused by
condensation making contact with the sensor’s internal heating
element.

A 1” bung (provided in the kit) will best protect the sensor. When
fully threaded, the sensor’s tip will sit flush with the exhaust pipe, this
does not adversely effect the readings.

The bung should always be welded before the Catalytic Converter.
Welding the bung after the catalytic converter will skew the readings
toward lean. The skew in readings will vary with engine load and the
efficiency of the catalytic converter....

Exhaust leaks, camshaft overlap, and open (shorty) exhausts will
cause false lean readings at light engine loads. Typically, once the
engine is under load and the exhaust gas volume increases, you will
see accurate readings.

When installed in the exhaust, the oxygen sensor must be connected
to a powered, functional MTX-L (no error codes) whenever the
engine is running. An un-powered sensor will be damaged in a short
period of time when exposed to exhaust gas.

Do not pre-warm the sensor before starting the engine, simply start
the engine as normal. Allowing the sensor to pre-warm before
starting the engine will increase the possibility of damaging the
sensor from shock-cooling.

The maximum temperature of the sensor at the bung (the sensor
mounting location) should not exceed 500 o
C or 900 F. If these temperatures are exceeded in your application you should install the Innovate Motorsports HBX-1 heat sink bung extender. (p/n 3729.)



Thanks.

[Thrasher22]

I feel very dumb asking this one, but I want to be sure so I don't spend a bunch of time chasing issues later.

I'm going through my engine and cleaning up the wiring (and everything), and there are a couple extra grounds on the engine. One is from the block to the body (near the aux battery relay), and one is from the top of the block to the bottom...

The wires look like they're from old lamp cord so they're not stock, am I right to assume these aren't needed?
_________________
1975 Westfalia - http://www.thesamba.com/vw/forum/viewtopic.php?t=516701

[busdaddy]

[Wildthings]

[eche_bus]

Type 4 engine oil drain plug crush washer: My new ones are copper, shaped like O-rings (rounded on both sides), but have a seam on one side. is there a "correct" orientation to best prevent leaks?

[ewdb92]

[Thrasher22]

[Thrasher22]

[busdaddy]

[Thrasher22]

Cool, thanks Bus Daddy! I'll take a better look and make sure it's where it should be tonight, I don't remember seeing one, but I could have missed it.
_________________
1975 Westfalia - http://www.thesamba.com/vw/forum/viewtopic.php?t=516701

[Finbay]

Hello,

I have bought 1970 Westfalia camper, but somebody has already started to disassembly everything and I dont know how to assembly/operate the rear seat. Can somebody send me photos of the rear seat assembly, from top to bottom? Pictures needed from the mounting to floor, cabinets, and the back rest, etc....

I am from Finland and there are few Westfalias here, but not single one that I personally would know. My car is originally from Ontario,Canada but it has been here from year 1972.

[ewdb92]

[Thrasher22]

Back again... I have zero ohms resistance between the primary on my ignition coil, does that mean it's kicked the bucket?

I'm pretty sure it does, but it worked before I took it out a week ago to paint the fan shroud, so I don't know why it would fail in that time.

And it's my 2nd coil this year...
_________________
1975 Westfalia - http://www.thesamba.com/vw/forum/viewtopic.php?t=516701

[Wildthings]

[Thrasher22]

[Thrasher22]

Another question: I accidentally dropped my fuel pressure regulator in a bucket of water, could that cause damage? I immediately pulled it out, drained it, and put it in the sun to dry, and didn't install it for a few days after.

I'm trying to eliminate all the reasons my engine wont' start again after taking everything out to fix some electrical gremlins and seal my tin.
_________________
1975 Westfalia - http://www.thesamba.com/vw/forum/viewtopic.php?t=516701

[lolight70]

Hi all
Thanx for looking
Is the cancelling cam that is part of the steering wheel on the opposite side of the turn signal switch or on the same side while the steering wheel is in the straight ahead position?
Hope it makes sense