rob323
Don't drive it, RALLY it!
Big end bearings ok?
3500rpm vibration
- Thread starter BMGTZ
- Start date
Help Support 4GTuner:
More food for thought....... Since it was an engine transplant, are you 100% sure that the 2 gearbox/engine block dowells were in place ? I've seen a lot of severe vibration issues directly related to one or more dowells not being present. What happens is the input shaft isnt centred on the crank and the clutch plate is then out of balance . In most cases the clutch centre tears out, and it is only then that it is discovered that a dowel or 2 are AWOL !
I was thinking balance shafts myself, but even when they're are phased 360 degrees out, the vibration is noticeable, but not THAT bad.... You can feel it at idle free revving the engine anyway.... So I have sort of discounted that balance shaft theory.
Mike
I was thinking balance shafts myself, but even when they're are phased 360 degrees out, the vibration is noticeable, but not THAT bad.... You can feel it at idle free revving the engine anyway.... So I have sort of discounted that balance shaft theory.
Mike
BMGTZ
Grumpy old man from the school of hard knocks
I am pretty certain that the block dowells are there because we just did a clutch and new alloy flywheel. I remember is being a stubborn on one dowell
lol.. some more questions...
1. Did you get the balance of the flywheel and pressure plate checked before you fitted them?
2. If they were balanced together as one bolted together unit, did you put them back together the same way that they were balanced?
3. Did you use loctite on the flywheel bolts and what torque spec did you set them at?
4. When fitting the gearbox, did you check for any excessive play in the input shaft?
5. Have you only just realised that the last time you remember seeing your favourite 12mm socket was when you accidentally dropped it inside the pressure plate? :lol:
1. Did you get the balance of the flywheel and pressure plate checked before you fitted them?
2. If they were balanced together as one bolted together unit, did you put them back together the same way that they were balanced?
3. Did you use loctite on the flywheel bolts and what torque spec did you set them at?
4. When fitting the gearbox, did you check for any excessive play in the input shaft?
5. Have you only just realised that the last time you remember seeing your favourite 12mm socket was when you accidentally dropped it inside the pressure plate? :lol:
BMGTZ
Grumpy old man from the school of hard knocks
that is there too..
you said there was 4g61 parts in there, who ever put the block together didnt use half and half? like keep one balance shaft and use the 4g61 oil pump?
the 4g61 oil pump doesnt have the balance on the pump side but still has access on front side for the balance shaft that takes the belt? not fun but could drop the sump off the check.
the 4g61 oil pump doesnt have the balance on the pump side but still has access on front side for the balance shaft that takes the belt? not fun but could drop the sump off the check.
BMGTZ
Grumpy old man from the school of hard knocks
seems like both shafts are there.....one was out of phase . fixed now. but I haven't checked the oil pump marks yet
VR-4Squid
Well-Known Member
BMGTZ said:
You need to have all the marks lined up correctly AND the balance shaft's in phase.
BMGTZ
Grumpy old man from the school of hard knocks
yep. I know thanks .....but I didn't build the engine. so I will check that out and see IF it cures the vibration.
I think I will get the rear shaft machined off to look like a straight shaft any way.....so the bearings can stay as they are. and I will remove the front.
