Member Since: 16 Sep 2019
Location: Swindon
Posts: 41
What's the correct timing?
During the total rebuild of my 3.0 TDV6, including replacing the crankshaft, I cannot guarantee that the starter ring/fly wheel, whatever you want to call it, was placed back in the correct position. This makes no difference to general operation of the vehicle, however it does cause issues when it comes to timing procedure. Long story short, the engine was back in the car with the body down and buttoned up before realising this could be a possibility (engine was turned over by hand to be sure valves weren't introduced to pistons).
Posting now because the car is only cranking and I'm getting a P0341-3a error (too many pulses).
So, to the main question: When the pins are inserted into the camshafts to lock them in position, where EXACTLY is #1 piston? Is it bang on TDC? A little past?
Thanks in advance, guys.. In a bit of a sticky situation here..
11th Oct 2019 7:19 pm
jenseneverest
Member Since: 12 Jun 2017
Location: somewhere
Posts: 769
correct me if wrong here, but have you now got 3 threads on essentially the same rebuilt engine not starting ? Why not just carry on from the original thread on the topic ?
12th Oct 2019 12:41 am
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5052
Re: What's the correct timing?
JafaDiscoIV wrote:
So, to the main question: When the pins are inserted into the camshafts to lock them in position, where EXACTLY is #1 piston? Is it bang on TDC? A little past?
Thanks in advance, guys.. In a bit of a sticky situation here..
The camshaft locking tool in itself has no influence on TDC!!
TDC refers only to the crank shaft position relative to No'1 cylinder at the top of its stroke (Top dead centre) The camshafts are "timed" via the belt to follow the sequential stroke of each subsequent cylinder, (timed 1 - 6) Therefore if you want to set TDC it must be done on the crank and not the camshafts. You need to remove the starter motor and insert the locking tool if you are looking for the crank TDC. I have never known a TDV6 crank move when changing belts, a mark with tippex will usually suffice without the need to remove the starter. However if you have stripped the engine you must use the crank locking tool to affirm TDC, and not the camshafts!!
TDC is measured at No'1 cyl with the locking tool and is exactly that (Top Dead Centre) so no increment either before or beyond that point.yµ (idµ - eAµ) ψ=mψ
12th Oct 2019 1:32 am
JafaDiscoIV
Member Since: 16 Sep 2019
Location: Swindon
Posts: 41
I realise that. The issue is that the locking tool that locks the crank engages in the flex plate. When reattaching the flex plate there's no way to know whether its in the correct position. With 8 fixing bolts, there are 8 possible positions. I can't be sure I have it in the correct one, thus I cant rely on the locking tool.
12th Oct 2019 11:51 am
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20844
The flexplate only bolts on 1 way. There is 1 single offset bolt hole My D3 Build Thread
Member Since: 16 Sep 2019
Location: Swindon
Posts: 41
You sir are an absolute saint. I believe you may have just saved my bacon. I checked the old crank and you're 100% right. I think you may have just fixed my car!! I'll be back!
12th Oct 2019 12:59 pm
JafaDiscoIV
Member Since: 16 Sep 2019
Location: Swindon
Posts: 41
Sure enough after setting the correct timing and reassembling late last night, pushed the button and it burst into life immediately! thanks for the help!!
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
