Date: Mon, 4 Apr 2005 14:10:11 -0400
Reply-To: Kim Brennan <kimbrennan@MAC.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Kim Brennan <kimbrennan@MAC.COM>
Subject: Re: why...vibration @ idle only when skidplate is installed --
turbodiesel engine
In-Reply-To: <ccafde090504041050512df4de@mail.gmail.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed
Just occurred to me another issue.....
In theory, the engine carrier should be firmly attached to the frame
(and perpendicular to it). With the skid plate attached, you are tying
into the frame in another location beyond the engine compartment. If
your body is wracked (from a rear end collision), or the engine carrier
not perpendicular to the frame (or incorrectly mounted to far forward)
the engine vibration would get transmitted into the frame forward.
Without the skid plate attached, the vibration is only going into the
transmissions and drive shaft and being absorbed by their carriers.
Try loosening the engine carrier bolts to the frame when attaching the
skid plate and then tightening things down...
On Apr 4, 2005, at 1:50 PM, BenT Syncro wrote:
> On Apr 4, 2005 7:34 AM, Kim Brennan <kimbrennan@mac.com> wrote:
>> Which portion of the skid plate, Ben? That around the engine, that
>> between the front and rear diffs? Or the front section? (note to
>> non-Doka owners, the front section is different than the tire carrier
>> typically found on passenger Vanagons, it really is a skid plate....
>>
>> The section between the transmissions would lead me to think that the
>> vibration was in the drive shaft, but if you were just sitting still
>> that shouldn't be the issue.
>>
>> The rear section is just tying the engine carrier to the middle
>> section. If that's heavily vibrating when connected, the vibration is
>> still there when not connected, it just isn't getting transmitted all
>> the way forward.
>>
>> That would mean engine mounts might need to be examined.
>>
>>
>
> Kim,
>
> It is indeed just the rear skidplate. You are corrected that my doka
> has a front skidplate in place of the tire carrier (spare tire is
> under rear bench).
>
> Anyway, there does not seem to be much vibration from the engine when
> the skidplate is off. Somehow this "sympathetic" vibration only works
> it's magic when everything is stuck together. I will re-examine the
> engine mounts as it is possible that the skidplate is creating some
> pressure to change something back there. I would have though that they
> changed the engine mounts when they installed the new engine. I'll
> have to check.
>
> BenT
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