Stripped-Out Plug - Type 4

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drober23
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Stripped-Out Plug - Type 4

Post by drober23 » Thu Mar 02, 2017 12:38 pm

I was headed to the park, boy and dog in tow, when I heard "fwa-fwa-fwa-fwa-fwa...". Investigation yielded the sight of the #4 sparkplug, wire still attached, disturbingly not where it belonged. I tried to replace it, but it just spun in the bore. Guh!

In retrospect, I had heard evidence this was coming (the occasional bit of extra-loudness as I started the engine), but did not realize what it was. When I looked for the noise I never found anything. I had not removed, nor touched, that spark plug since spring of 2015. I do not remember anything untoward about that spark plug or cylinder ever.

On the bright side, the end of the spark plug was a beautiful light brown, sort of like you want to toast a marshmallow to if you aren't the masochistic type that likes to completely immolate them.

Feel free to chip in with what I should have been doing to notice this before it failed on the side of the road.

DJ Roberts
DJ

'75 Westfalia, '79 Deluxe
(plus more busses than sense)

In a time of chimpanzees I was a monkey

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Amskeptic
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Re: Stripped-Out Plug - Type 4

Post by Amskeptic » Mon Mar 06, 2017 1:13 pm

drober23 wrote:
Thu Mar 02, 2017 12:38 pm
I do not remember anything untoward
DJ Roberts
Are these Len heads?
Any evidence of a Timesert in there or still threaded into the plug?
What do you normally "torque" your plugs to?
Colin
Deposits All In By April 30th!
BobD - 1978 Bus . . . . . . . . . . .110,230 miles
Chloe - 1970 bus . . . . . . . . . . .188,616 miles
Naranja - 1977 Westfalia . . . . 70,830 miles
Pluck - 1973 Squareback . . . . . 55,560 miles

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drober23
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Re: Stripped-Out Plug - Type 4

Post by drober23 » Sun Mar 12, 2017 11:48 am

These are Len heads.
I have not scrutinized it enough to see if there is a Timesert in there, but I would be surprised to find one.
I normally torque my plugs to 22 ft/lbs (Bentley), but I cannot in good faith assure you that I used a torque wrench the last time I had the plugs out (which would have been spring of 2015).
DJ

'75 Westfalia, '79 Deluxe
(plus more busses than sense)

In a time of chimpanzees I was a monkey

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Re: Stripped-Out Plug - Type 4

Post by Amskeptic » Mon Mar 13, 2017 10:26 am

drober23 wrote:
Sun Mar 12, 2017 11:48 am
These are Len heads.
I have not scrutinized it enough to see if there is a Timesert in there, but I would be surprised to find one.
I normally torque my plugs to 22 ft/lbs (Bentley), but I cannot in good faith assure you that I used a torque wrench the last time I had the plugs out (which would have been spring of 2015).
I will never never never use Bentley specs here. YES, the grip slackens considerably after a few heat cycles with newly installed plugs and springy crush washers, but once the plugs have been in for a while, and the crush washers are flattened, I torque barely to snug + a little huwongfff.
Colin
Deposits All In By April 30th!
BobD - 1978 Bus . . . . . . . . . . .110,230 miles
Chloe - 1970 bus . . . . . . . . . . .188,616 miles
Naranja - 1977 Westfalia . . . . 70,830 miles
Pluck - 1973 Squareback . . . . . 55,560 miles

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drober23
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Re: Stripped-Out Plug - Type 4

Post by drober23 » Mon Mar 13, 2017 2:47 pm

I will look things back up in Bentley when I don't do them very often. When I install new plugs I try to torque them. If I have one out after a while I'm pretty sure I follow your alternate procedure to the T.
DJ

'75 Westfalia, '79 Deluxe
(plus more busses than sense)

In a time of chimpanzees I was a monkey

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drober23
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Re: Stripped-Out Plug - Type 4

Post by drober23 » Sun Apr 16, 2017 5:58 pm

Finally got to work a bit on the bus this week.

Firstly, no timesert in cylinder #4 (the stripped one). The one going in will be the first. Still plan to pull the heads off the engine. Disassembly has begun with the engine still in the bus, but the engine is ready to come out now.

I pulled the heat exchangers. They are fairly rough. Does anyone have a paint recommendation for exhaust components? Also, no evidence of a copper washer between the heads and the pipes. But also zero indication of any leakage having happened there. I plan on putting them in when I reinstall.

Did have some oil under the engine. Pretty sure the culprit is the fitting for the remote oil pressure hose. I put in an oil pressure gauge, which required a T fitting. Used an 18" hose to bring that fitting away from the engine case.

The thin little flaps that mount on the fan shroud are missing. (the ones that keep the air from being pushed into the engine compartment) Edit: Found these at CIP1. http://www2.cip1.com/ProductDetails.asp ... 19-263-APR

Haven't had my engine out for several years now, so there's quite a list of things to do! First is to change the fuel lines.
DJ

'75 Westfalia, '79 Deluxe
(plus more busses than sense)

In a time of chimpanzees I was a monkey

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Amskeptic
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Re: Stripped-Out Plug - Type 4

Post by Amskeptic » Mon Apr 17, 2017 7:23 am

drober23 wrote:
Sun Apr 16, 2017 5:58 pm
Finally got to work a bit on the bus this week.

Firstly, no timesert in cylinder #4 (the stripped one). The one going in will be the first. Still plan to pull the heads off the engine. Disassembly has begun with the engine still in the bus, but the engine is ready to come out now.

I pulled the heat exchangers. They are fairly rough. Does anyone have a paint recommendation for exhaust components? Also, no evidence of a copper washer between the heads and the pipes. But also zero indication of any leakage having happened there. I plan on putting them in when I reinstall.

Did have some oil under the engine. Pretty sure the culprit is the fitting for the remote oil pressure hose. I put in an oil pressure gauge, which required a T fitting. Used an 18" hose to bring that fitting away from the engine case.

The thin little flaps that mount on the fan shroud are missing. (the ones that keep the air from being pushed into the engine compartment) Edit: Found these at CIP1. http://www2.cip1.com/ProductDetails.asp ... 19-263-APR

Haven't had my engine out for several years now, so there's quite a list of things to do! First is to change the fuel lines.


This is not the Raby engine is it? Missing flaps? Missing copper o-rings? Stripped plugs? Tell me it ain't so.
Make sure the copper ring is actually missing. Sometimes it is sooty up there and you can't really tell.
Colin
Deposits All In By April 30th!
BobD - 1978 Bus . . . . . . . . . . .110,230 miles
Chloe - 1970 bus . . . . . . . . . . .188,616 miles
Naranja - 1977 Westfalia . . . . 70,830 miles
Pluck - 1973 Squareback . . . . . 55,560 miles

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