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oshima
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Joined: December 12, 2011
Posts: 112
Location: Knoxville, TN
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 Posted: Sat Mar 01, 2014 1:54 pm Post subject: 1978 FI - What the heck is this sound? |
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Anyone have any idea what might be making this sound?
It sounds too intermittent for a rod knock. It just started when I was driving home. Didn't get any better or worse at idle. Maybe a nut or bolt fell into the fan? Anyone have any experience with this?
Thanks. |
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Randy in Maine
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Joined: August 03, 2003
Posts: 34890
Location: The Beach
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| Posted: Sat Mar 01, 2014 2:09 pm Post subject: |
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Guess...
Exhaust leak or 2 plug wires swapped. |
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oshima
Samba Member
Joined: December 12, 2011
Posts: 112
Location: Knoxville, TN
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| Posted: Sat Mar 01, 2014 2:45 pm Post subject: |
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| Randy in Maine wrote: |
Guess...
Exhaust leak or 2 plug wires swapped. |
Thanks for the response.
All the plug wires are in the right place. Would an exhaust leak cause a metallic clanging like that? How would I test for it? |
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Randy in Maine
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Joined: August 03, 2003
Posts: 34890
Location: The Beach
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| Posted: Sat Mar 01, 2014 2:52 pm Post subject: |
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| I would shove a wet rag or a potato in the exhaust pipe and have yoru lovely assistant start the bus while you are underneath the engine looking for an exhaust leak where 2 flanges mate up. |
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oshima
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Joined: December 12, 2011
Posts: 112
Location: Knoxville, TN
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| Posted: Sat Mar 01, 2014 2:55 pm Post subject: |
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| Aaand on a whim I pulled open the valve cover to see what was inside and I found a couple metal shavings. Crap. |
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Randy in Maine
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Joined: August 03, 2003
Posts: 34890
Location: The Beach
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| Posted: Sat Mar 01, 2014 3:08 pm Post subject: |
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Show us a good picture of the metal shavings.
Is it possible that a nut came off in there? |
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oshima
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Joined: December 12, 2011
Posts: 112
Location: Knoxville, TN
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EZ Gruv
King of Plaid
Joined: December 10, 2002
Posts: 8544
Location: Las Vegas
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| Posted: Sat Mar 01, 2014 4:44 pm Post subject: |
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Get a nut on there and adjust the valves (all of them). See how it sounds then.
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1977 Deluxe Westfalia - 2.0L FI Type IV, Completely Original
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oshima
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Joined: December 12, 2011
Posts: 112
Location: Knoxville, TN
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| Posted: Sat Mar 01, 2014 5:01 pm Post subject: |
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| The thing that worries me most is that the nut was definitely on there last time I put the cover on. Maybe it fell down the pushrod tube? I'll check in the morning. |
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Wildthings
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Joined: March 13, 2005
Posts: 50347
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| Posted: Sat Mar 01, 2014 8:40 pm Post subject: |
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| If it went down one of the pushrod tubes, it may be sitting harmlessly in the oil sump. Can't guaranty this though. You could pull the oil pickup screen and fish around in the sump for the nut with a magnet. I guess it could still be sitting in one of the lifter bores as well. Pulling the pushrod tubes on that side of the engine and taking a peek should tell you if this is so. You might be able to just remove the rockers and shine a pen light down the tubes to see what might be hid down there. |
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Danwvw
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Joined: July 31, 2012
Posts: 8892
Location: Oregon Coast
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| Posted: Sat Mar 01, 2014 8:47 pm Post subject: |
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If the nut is not anywhere to be found under the valve cover it's hard to imagine it would make it into one of the tubes very far. I would pull the rockers and push rods and fish for it down the tubes first with them still in place first. (Probably have to pull the engine to remove the tubes?)
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SGKent 
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Joined: October 30, 2007
Posts: 41031
Location: Citrus Heights CA (Near Sacramento)
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| Posted: Sat Mar 01, 2014 9:02 pm Post subject: |
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| Danwvw wrote: |
| If the nut is not anywhere to be found under the valve cover it's hard to imagine it would make it into one of the tubes very far. I would pull the rockers and push rods and fish for it down the tubes first with them still in place first. (Probably have to pull the engine to remove the tubes?) |
T4 pushrod tubes come out the head side. They are held in with a retaining wire.
FWIW - always check the nuts before a valve adjust.
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udidwht
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Joined: March 06, 2005
Posts: 3779
Location: Seattle, WA./ HB, Ca./ Shizuoka, Japan
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| Posted: Sun Mar 02, 2014 12:10 am Post subject: |
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| SGKent wrote: |
| Danwvw wrote: |
| If the nut is not anywhere to be found under the valve cover it's hard to imagine it would make it into one of the tubes very far. I would pull the rockers and push rods and fish for it down the tubes first with them still in place first. (Probably have to pull the engine to remove the tubes?) |
T4 pushrod tubes come out the head side. They are held in with a retaining wire.
FWIW - always check the nuts before a valve adjust. |
Also make sure and check each adjuster nut with your fingers before replacement of the valve cover. I'm betting you forgot to snug one down.
It's also very apparent based on that photo that those heads have guide issues and have been overheated on more than 1 occasion.
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1972 Westy Hardtop/Type-4 2056cc
96mm Biral AA P/C's~7.8:1CR
Headflow Masters New AMC 42x36mm heads w/Porsche swivel adjusters
71mm Stroke
73 Web Cam w/Web solids
Dual 40mm IDF Webers - LM-2 - 47.5 idles/125 mains/190 air corr./F11 tubes/28mm Vents - Float height 10.45mm/Drop 32mm
Bosch SVDA w/Pertronix module (7.5 initial 28 total @ 3400rpm)
Bosch W8CC plugs
Pertronix Flamethrower 40K coil
S&S 4-1 w/Walker QP 17862
3 rib 002 Trans
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oshima
Samba Member
Joined: December 12, 2011
Posts: 112
Location: Knoxville, TN
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| Posted: Mon Mar 03, 2014 9:09 am Post subject: |
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Thanks everyone. I pulled the rockers and pushrods and the nut had wedged in the exhaust #1 pushrod tube. The nut was in SERIOUSLY bad shape.
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Wildthings
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Joined: March 13, 2005
Posts: 50347
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| Posted: Mon Mar 03, 2014 9:27 am Post subject: |
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| Should be easy at this point, just find a replacement, install it, and move on. Depending on how beat they are you might also consider a new tube and pushrod. Note, that there are two size nuts used on Type 4 engines, yours should be the 10mm ones. |
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Tcash
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Joined: July 20, 2011
Posts: 12844
Location: San Jose, California, USA
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| Posted: Mon Mar 03, 2014 9:54 am Post subject: |
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Hello
What does the Pushrod and Tube look like?
Make sure to change your oil.
Good Luck |
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oshima
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Joined: December 12, 2011
Posts: 112
Location: Knoxville, TN
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| Posted: Mon Mar 03, 2014 9:56 am Post subject: |
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Already did and it's running great.
By the way, how can you tell the heads are burned/out of line with this picture? Just curious. |
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Desertbusman
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Location: Arizona
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| Posted: Mon Mar 03, 2014 11:26 am Post subject: |
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| oshima wrote: |
| By the way, how can you tell the heads are burned/out of line with this picture? Just curious. |
All the brown is from cooked oil.
16 years and mine have no brown. All that's there is oily aluminum colored aluminum.
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Wildthings
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Joined: March 13, 2005
Posts: 50347
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| Posted: Mon Mar 03, 2014 3:49 pm Post subject: |
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These is one of the heads off my 1800, it has 250K miles on it since the last rebuild.
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