Date: Tue, 1 Feb 2005 08:06:00 -0800
Reply-To: Mike Miller <mwmiller@CWNET.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Mike Miller <mwmiller@CWNET.COM>
Subject: Re: wrist pins Boston bob
In-Reply-To: <62bb01c5084e$c87af5e0$6601a8c0@yoursz6x6sefxo>
Content-type: text/plain; charset="US-ASCII"
Thanks yet again Bob. I've passed this along to the owner of the van in
question. Nice to have lots of experience available on the list. Long
drive to either your old or new residence otherwise.
Yeah for the list and people like you.
Mike
On 2/1/05 3:11 AM, "ROBERT DONALDS" <donalds1@VERIZON.NET> wrote:
> Mike
> funny my name should pop up in the subject line I had been pecking away at a
> response over my hectic weekend
>
> assuming the mains are loose then you are back to the point where the mains
> where before the reassembly and some people drive the 1.9s this way for a
> while. The same old question for the 2.1s is relevant for the 1.9 does the
> oil light come on at an Idle and what are your intentions for the this van.
> Is it go the store OR are we headed to the west coast at a high rate of
> speed with a 1000 pds of your favorite stuff, camping gear and the dog
>
> SHAMELESS PLUG
> I have been alignboring 2.1 20 1.9 and bug cases for the last few years and
> I stock hundreds of sets of German mains bearing sets
> I have also had made some oversize rear mains for the 2.0 with an oversize
> thrust and 1.9 mains in 20 and 40 over on the case
> The boring bar will be set up for a run of 2.0 cases in the next weeks so
> now is the time to send my your degreased 2.0 case.
> you could be waiting weeks in the springto get the job done
>
>
>
> Boston Bob
>
>
>
> ----- Original Message -----
> From: "Mike Miller" <mwmiller@CWNET.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Monday, January 31, 2005 10:03 PM
> Subject: Re: wrist pins Boston bob
>
>
>> Many thanks to the engine meister. Once again sense prevails. OK not
>> everywhere but my friend will be happy. I hope.
>>
>> If this noise is the result of not align boring the case how long does the
>> engine have before another rebuild?
>>
>> Thanks again, Bob.
>>
>> Mike
>>
>> On 1/31/05 5:27 PM, "ROBERT DONALDS" <donalds1@verizon.net> wrote:
>>
>>> Mike, Jimt and fellow vanagon types
>>>
>>> The wrist pin noise is not what it sounds like pun intended The term
>>> wrist
>>> pin noise is a piston slap unless the bushing comes loose in the rod and
>>> the
>>> piston rattles around then its just called engine failure
>>> Wrist pin noise or piston slap is heard when the piston does not
>>> transition
>>> from one side (skirt) to the other just before the piston reaches
>>> TDC..Pistons are made with an offset wrist pin hole the offset is in the
>>> WBX
>>> piston is 1MM with this offset the piston gently transitions the piston
>>> unless of course you install the piston backwards. Other things that can
>>> cause a piston to not transaction are damaged pistons or tight fitting
>>> rod
>>> bushings . Most con rods also have an offset top to bottom the top sits a
>>> little
>>> to the left or right depending on what side of the engine we are talking
>>> about. When the rod is installed backwards it can touch the wrist pin
>>> boss
>>> of the piston and hold a little side pressure on the piston and this
>>> prevents the piston from transitioning and you can hear that for sure. I
>>> had
>>> one fellow bring in an WBX engine that he had taking apart more than once
>>> tiring to find the rapping noise with no luck I was brought in for the
>>> autopsy it was the rods on backwards
>>> The air cooled bug engines can have a wrist pin noise if the rod bushing
>>> is
>>> worn but its minor AND WOULD LAST FOR EVER most water cooled engine may
>>> have as much noises but the water jacket is a great noise damper
>>> One other thought about wrist pins is that if the bushing is damaged when
>>> the piston pin is installed then the bushing can come loose over time the
>>> signs of bushing damage is that the piston does not float on the con rod
>>> after it installed this is hard to check when the cylinder and piston go
>>> onto the rod at the same time with little room to wiggle the piston on
>>> the
>>> pin.
>>> I think that the chances are that its not a wrist pin noise but more
>>> likely
>>> a lifter, rocker or crank rattling around in the case. Loose main
>>> bearings
>>> are common in the 1.9 enignes at about 20 to 30Kwhen the block is not
>>> align
>>> bored at the time of the rebuilding or reassembling. If you suspect the
>>> main bearings are loose in the case check for exsessive crankshaft
>>> endplay
>>> its a dead giveaway for loose mains
>>>
>>> yes I ramble what's your point
>>>
>>>
>>> going faster miles an hour with the heat on
>>> I remain
>>> Bob Donalds
>>> Boston Engine
>>> http://www.bostonengine.com
>>>
>>>
>>> ----- Original Message -----
>>> From: "Mike Miller" <mwmiller@CWNET.COM>
>>> To: <vanagon@GERRY.VANAGON.COM>
>>> Sent: Saturday, January 29, 2005 2:58 PM
>>> Subject: Wrist pins
>>>
>>>
>>>> Volks, especially engine volks,
>>>>
>>>> A friend has a 85 van with less than 30k on a rebuilt engine. Mechanic
>>>> says
>>>> that the new noise in it is wrist pins, dump it.
>>>>
>>>> What are the chances it is wrist pins with that many miles?
>>>>
>>>> Is that an engine killer with van engines, or like piston slap in the
>>>> early
>>>> Audi 5 cylinders, let them slap?
>>>>
>>>> TIA
>>>>
>>>>
>>>> Mike
>>>>
>>>
>>>
>>>
>>>
>>
>
>
| 
