Jump to content
SAU Community

VQ25DD Timing Chain/Engine replacement

Spoddy

By Spoddy,
in V Series (V35, V36, V37 & Infiniti)

 Share

Recommended Posts

Spoddy Apprentice

Spoddy

Posted
Posted

Hi All,

I have a Skyline V35 with VQ25DD engine (215000km) that has engine noise.  The internet says its probably the timing chain, and it sounds like it to me. Runs OK otherwise. Is it possible to verify this is the cause before spending too much time/money on it? Am thinking perhaps I remove the small covers on each side of the timing chain cover (over the camshaft sprockets) and look inside. Not sure what to measure once I'm there however.

Assuming it is the timing chain I see a couple of options:

1. Fix the chain. Does anyone have any recommended kit brands and/or suppliers?

2. Replace the engine. Not many good ones around however. Is it possible to fit any other engines eg VQ25DE or perhaps a 3.0 or even 3.5L variant? Not too interested in spending a lot of time reprogramming ECUs. 

David

joshuaho96 Veteran

joshuaho96

Posted
Posted
25 minutes ago, Spoddy said:

Hi All,

I have a Skyline V35 with VQ25DD engine (215000km) that has engine noise.  The internet says its probably the timing chain, and it sounds like it to me. Runs OK otherwise. Is it possible to verify this is the cause before spending too much time/money on it? Am thinking perhaps I remove the small covers on each side of the timing chain cover (over the camshaft sprockets) and look inside. Not sure what to measure once I'm there however.

Assuming it is the timing chain I see a couple of options:

1. Fix the chain. Does anyone have any recommended kit brands and/or suppliers?

2. Replace the engine. Not many good ones around however. Is it possible to fit any other engines eg VQ25DE or perhaps a 3.0 or even 3.5L variant? Not too interested in spending a lot of time reprogramming ECUs. 

David

Use some rubber hose to narrow down where the noise is coming from. I couldn't tell you for sure whether there are any easy direct swaps but most likely you're going to need a new ECU at the very least.

GTSBoy Grand Master

GTSBoy

Posted
Posted

You're not swapping a 25DD with any other engine without it being a big exercise.

A proper timing chain inspection requires the front covers to come off so you can see the state of the tensioners and guides (which might be worn) and assess the amount of chain stretch.

V35_Paul Veteran

V35_Paul

Posted
Posted

See if the noise goes away when you turn the AC off.

My mate was sure it was the timing chain on her 350Z but one day she turned her AC off and the noise was gone. Only make that awful noise when the AC was on. 

I assume clutch plate on the AC was the problem. 

Not the timing chain. So she sold the car in winter. Rude as.

 

Spoddy Apprentice

Spoddy

Posted
  • Author
Posted (edited)

I spent a bit of time trying to find the source of the noise, with and without a piece of garden hose. I dont think its the timing chain, I think its coming from underneath the intake plenum on the passenger side. Am guessing its an incorrect valve clearance. I'll take the intake plenum and rocker cover off tomorrow and poke around with feeler gauges.

I see it uses shims. Are these hard to get? Where do you get them from - is amayama.com OK or is there somewhere better? I guess I'll also replace the spark plugs and I'll probably need some gaskets.

 

Edited by Spoddy
poor terminology

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • sinn3r
      R34 Skyline climate control unit transistor

      By sinn3r · Posted

      perhaps i should have mentioned, I plugged the unit in before i handed over to the electronics repair shop to see what damaged had been caused and the unit worked (ac controls, rear demister etc) bar the lights behind the lcd. i would assume that the diode was only to control lighting and didnt harm anything else i got the unit back from the electronics repair shop and all is well (to a point). The lights are back on and ac controls are working. im still paranoid as i beleive the repairer just put in any zener diode he could find and admitted asking chatgpt if its compatible   i do however have another issue... sometimes when i turn the ignition on, the climate control unit now goes through a diagnostics procedure which normally occurs when you disconnect and reconnect but this may be due to the below   to top everything off, and feel free to shoot me as im just about to do it myself anyway, while i was checking the newly repaired board by plugging in the climate control unit bare without the housing, i believe i may have shorted it on the headunit surround. Climate control unit still works but now the keyless entry doesnt work along with the dome light not turning on when you open the door. to add to this tricky situation, when you start the car and remove the key ( i have a turbo timer so car remains on) the keyless entry works. the dome light also works when you switch to the on position. fuses were checked and all ok ive deduced that the short somehow has messed with the smart entry control module as that is what controls the keyless entry and dome light on door opening   you guys wouldnt happen to have any experience with that topic lmao... im only laughing as its all i can do right now my self diagnosed adhd always gets me in a situation as i have no patience and want to get everything done in shortest amount of time as possible often ignoring crucial steps such as disconnecting battery when stuffing around with electronics or even placing a simple rag over the metallic headunit surround when placing a live pcb board on top of it   FML
    • dbm7
      R34 Skyline climate control unit transistor

      By dbm7 · Posted

      Bit of a pity we don't have good images of the back/front of the PCB ~ that said, I found a YT vid of a teardown to replace dicky clock switches, and got enough of a glimpse to realize this PCB is the front-end to a connected to what I'll call PCBA, and as such this is all digital on this PCB..ergo, battery voltage probably doesn't make an appearance here ; that is, I'd expect them to do something on PCBA wrt power conditioning for the adjustment/display/switch PCB.... ....given what's transpired..ie; some permutation of 12vdc on a 5vdc with or without correct polarity...would explain why the zener said "no" and exploded. The transistor Q5 (M33) is likely to be a digital switching transistor...that is, package has builtin bias resistors to ensure it saturates as soon as base threshold voltage is reached (minimal rise/fall time)....and wrt the question 'what else could've fried?' ....well, I know there's an MCU on this board (display, I/O at a guess), and you hope they isolated it from this scenario...I got my crayons out, it looks a bit like this...   ...not a lot to see, or rather, everything you'd like to see disappears down a via to the other side...base drive for the transistor comes from somewhere else, what this transistor is switching is somewhere else...but the zener circuit is exclusive to all this ~ it's providing a set voltage (current limited by the 1K3 resistor R19)...and disappears somewhere else down the via I marked V out ; if the errant voltage 'jumped' the diode in the millisecond before it exploded, whatever that V out via feeds may have seen a spike... ....I'll just imagine that Q5 was switched off at the time, thus no damage should've been done....but whatever that zener feeds has to be checked... HTH
    • 25RBGT
      Got this r31 silhouette flood car to rebuild.

      By 25RBGT · Posted

      First time we have seen lights 
    • Wazmond
      WGNC34 - floor mats

      By Wazmond · Posted

      I think Fitmit had some, have a look on there (theyre Australian as well)
    • soviet_merlin
      Howdy Y'all

      By soviet_merlin · Posted

      Hah, fair enough! But if you learn with this one you can drive any other OEM manual. No modern luxury features like auto rev-matching or hillstart assist to give you a false sense of confidence. And a heavy car with not that much torque so it stalls easily. 
×
×
  • Create New...