I have reinstalled the stock rockers and it still taps. I never did
get a true reading of the timing with my light, but somthing tells me
that the timing mark shouldn,t disappear under the water pump and only
reappear when I open the tb up. Even then it doesn't come but about
4-6 degrees before tdc.
WiLieR
On 5/4/07, Bernd D. Ratsch <bernd@dodgetrucks.org> wrote:
>
> It will vary depending on a variety of sensor inputs (BARO, CTS, BTS, IAT,
> O2), but normally it'll be somewhere in between 4-12.
>
> Are you sure it's not the roller rockers you're hearing?
>
> - Bernd
>
> -----Original Message-----
> From: WiLieR[SS] [mailto:waffle787@gmail.com]
> Sent: Friday, May 04, 2007 8:40 PM
> To: dakota-truck@dakota-truck.net
> Subject: DML: Timing 3.9 v-6
>
>
> I know the timing can't be adjusted by rotating the distributor and such,
> but what is the base timing of a 96 3.9 v-6 when at operating temp and at
> idle? I am having so tapping issues andf have exhausted all the upper end
> engine possibilities. New parts are as follows:
> lifters, head gaskets, 1.7 harland roller rockers, valve springs, pushrods,
> intake gaskets (including plenum pan), heads completely checked over with
> some blending and polishing work done.
>
> The tapping is not a ping or knock as I have tried everything from 87 octane
> to 93 octane with octane boost in it. I can hear the noise in both cylinder
> heads and the exhaust manifolds with a noticeable noise in the exhaust tone
> (no cat and flowmaster 40 series). It is a rhytmic tapping that cahnges
> with rpm. The tapping goes away when the engine is under load but reappears
> immediately when not under load (cruising, idling or deceleration). It is
> loud enough to be heard as an echo off close buildings, bridge sides,
> fences, etc... I have tried 10w-30 and 20w-50 oils with no difference at
> all. Oil pressure is strong, even when the engine is warm.
>
> It is driving me nuts! It literally sounds like a garden gnome high on
> caffiene and sugar pills in my engine with a ball pein hammer!
>
> Any ideas? Much more of this will cause me to start randomly smashing those
> little gnomes when I see them.
>
> WiLieR
>
>
>
>
This archive was generated by hypermail 2b29 : Fri Jun 01 2007 - 09:06:10 EDT