Vanagon EuroVan
Previous messageNext messagePrevious in topicNext in topicPrevious by same authorNext by same authorPrevious page (May 2015, week 3)Back to main VANAGON pageJoin or leave VANAGON (or change settings)ReplyPost a new messageSearchProportional fontNon-proportional font
Date:         Thu, 21 May 2015 21:35:49 -0400
Reply-To:     Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject:      Re: Start up, back fire?
Comments: To: Dennis Jowell <dennisjowell@GMAIL.COM>
Content-Type: text/plain; charset="us-ascii"

There can be 2 issues with spark plugs. The first has to do with contamination. Any of the grease and metallic stuff can short the plug out. The other has to do with the torque spec and preload retention. Spark plugs like many common fasteners have torque specs based on the "as received" condition. This spec is to provide some tension, preload pressure, what have you on the connection. Depending on the materials involved (plug plating, head material), the anti-seize can reduce the torque required for that tension by some 40%. So instead of 14 lb. ft. you may only need 10 lb. ft. Now the spark plug and head expand at vastly different rates and the plug body will get much hotter than the head. This will give you different expansion rates along the thread. With a really good lubricant this can help the plug creep out as there will only be the friction of the gasket assuming that also did not get lubed. If you use the anti-seize and still torque to the dry specification you can stress the threads or on a really bad day break the plug. Yes I've seen it!

Many mechanics fear over tightening spark plugs due them seizing in place or having the threads in the head fail. Unfortunately a loose plug ca damage the threads due to the hot gasses getting by. A plug blowing out makes for a really noisy event.

Dennis

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Dennis Jowell Sent: Thursday, May 21, 2015 5:50 AM To: vanagon@GERRY.VANAGON.COM Subject: Re: Start up,back fire?

Dennis, tell me about anti seize. What does that do to the plugs?

Dennis Jowell Scotch Hollow Farm Newbury, Vermont

> On May 20, 2015, at 7:24 PM, Dennis Haynes <d23haynes57@hotmail.com> wrote: > > So now the next question is this. Did they leave a plug loose or is > something going wrong that caused it to loosen? Does this engine have > new or used heads? I have seen the heads crack across the spark plug > holes, clear across both of them. I have also seen spark plugs with > defective threads. I dealt with engines that had plugs loosen and even > blow out. Inspect carefully. Install with a torque wrench. Do not use > an anti-seize. Monitor the situation. > > After an installed engine gets some miles and has a chance to break in > a compression test, leak down test, and oil pressure test is a good idea. > Provides a baseline and should there be a deficiency gives an > opportunity for corrective action early in the warranty period. As an > added touch oil analysis can be the next friend. > > Dennis > > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On > Behalf Of Dennis Jowell > Sent: Tuesday, May 19, 2015 6:03 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: Start up,back fire? > > I just called GOWESTY and they did supply and installed the spark > plugs for the new 2.2 engine that was installed in my 88' westy. So I > must apologize that the mechanic who installed my engine did not mess up the plugs problem. > Thanks for the information and I stand corrected. > > > Dennis Jowell > Scotch Hollow Farm > Newbury, Vermont > > >> On May 16, 2015, at 4:26 PM, Dennis Haynes <d23haynes57@HOTMAIL.COM> > wrote: >> >> As GoWesty supplied the engine why ask them why there is a problem >> with > the fuel or ignition management of that engine installation? They are > also too are away to do any troubleshooting. Now if this should be > attributable to a mechanical problem in the engine then they should be > involved ASAP. I have seen enough engine problems due to a bad > installation or the reason for the original failure not being > diagnosed or corrected to look at that stuff first. >> >> Dennis >> >> >> -----Original Message----- >> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On >> Behalf Of > Dave Mcneely >> Sent: Saturday, May 16, 2015 10:42 AM >> To: vanagon@GERRY.VANAGON.COM >> Subject: Re: Start up,back fire? >> >> Dennis, obviously, the engine is running too rich. Why? I would put >> that > question to GoWesty. >> >> ---- Dennis Jowell <dennisjowell@GMAIL.COM> wrote: >>> Question on why do I sometimes get a backfire from my 2.2 GOWESTY WBX. > yesterday I drove the 88 gl Westy an 1.5 hr pulled over to check my > GPS, shut the engine off. Then 2 minutes later started it and "bang" > it backfired, it did start. Shut it down and tried again same thing. > Drove home it didn't occur again. Any thoughts of what is going on? > The new Engine has about 5000 miles on it. Maybe to many mice running around in there. >>> >>> Dennis Jowell >>> Scotch Hollow Farm >>> Newbury, Vermont >> >> -- >> David McNeely


Back to: Top of message | Previous page | Main VANAGON page

Please note - During the past 17 years of operation, several gigabytes of Vanagon mail messages have been archived. Searching the entire collection will take up to five minutes to complete. Please be patient!


Return to the archives @ gerry.vanagon.com


The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.

Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.