VH45DE Timing Question (ATTN: Wes, Q45Tech, Maxnix)

[Raxephon]

I got something picking at my brain and I need some help.

VH45DE

Crankshaft is at TDC

Cylinders #1 & #6 are at the same height (Almost)

Camshafts are placed so as to allow access to the headbolts (Notches in cams face inwards)- (Almost)

Silver links match with markings on cam sprockets

Gold links match with notches in crank sprockets

Thats the scenario, here's the question:

How many revolutions of the crank before all 6 timing marks line up again?

If this has been answered, sorry, but I must have overlooked it in my search.

[elwesso]

Im afraid I can only re-iterate whats in the FSM as thats all there is... You have to time the passenger side, get it kosher, and hten do the drivers....

Im going to have blackbirdVQ who just recently timed his VH45 to chime in.

[DominickJ30]

Man I havent done this in a while, I would probably have to get a book out to check.

Im sure Q45Tech will chime in with the answer.

[maxnix]

My guess is 4 because all the cylinders should be lined up again.

I don't get the reason for the question, though.

[Raxephon]

Im afraid I can only re-iterate whats in the FSM as thats all there is...

I've been back & forth through the FSM and the archives here, still can't find the answer I'm looking for.

My guess is 4 because all the cylinders should be lined up again.

I don't get the reason for the question, though.

I always thought that it was 2 strokes for every complete turn of the crankshaft.

My reasoning?

Its a question I have, that I couldn't find the answer to.

Sooo, I ask the more experienced Q45 owners for their thoughts on the matter.

*Just for reference, this is the first DOHC V8 I've owned/rebuilt*

[BlackBirdVQ]

I am affraid no one will have the answer to this question. I have done timing chains on VH, KA, VQ, SRs and GAs and they all have these "traveling" links that move every revolution. When I timed my VH not too long ago I turned it over once and the timing chain moved and the gold links where no longer aligned with the timing dots on the sprockets. There should be 19 holes in the chain between the intake and exhaust sprocket dots. FSM specifies that you should turn the crank approx 120 deg clock wise and then install the driver's side cylinder head timing chain.

I'm sure given enough crankshaft revolutions the links will once again line up with the sprockets, but I never had enough time to actually veriffy how many revolutions.

[Q45tech]

The cam 36 teeth and crank 18 so count the chain links to determine revs to complete. For cams to run at 50% of crank...crank 360 degrees vs cam 720 the ratio must always be 2:1.

[Raxephon]

The cam 36 teeth and crank 18 so count the chain links to determine revs to complete. For cams to run at 50% of crank...crank 360 degrees vs cam 720 the ratio must always be 2:1.

Exactly how are you counting the teeth?

Mine are 38 cam/19 crank.

[Raxephon]

The following is true for both right & left banks:

"There are 8 plates/holes between the two silver links"

"There are 24 Plates/holes between the driver-side silver link and the gold link on the crank sprocket"

"There are 25 Plates/Holes between the passenger-side silver link and the gold link on the crank sprocket"

"There are a total of 60 Plates/holes and 120 Pins on the timing chain, This includes both silver links and the gold link at the crank"
Modified by anlasak at 10:45 PM 2/4/2006

[Q45tech]

You are CORRECT [per picture] , my memory must be failing. But it's been years since I last counted for a project.

That's kind of odd since 720/38=18.947 degrees per cam gear tooth must be something to do with high speed chain stretch aging compensation.

60/20 roughly 3 rev to move chain around completely.

[FarFetched]

It is always 2 revs of crank to get cams lined up again. That is as far as I know.! It been always 2:1 ration crank:camsCheers!

[RobertsnewQ]

The MFG uses odd numbers of teeth so that the chain floats around and every link touches every tooth. If they were even, each tooth would hit the same few links and any wear would tend to concentrate in a few areas.

Same reason transmission gears have odd numbers of teeth.