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Variators: Which engine

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#103 ·
67rschev said:
Hello all first time poster here. I've been a long time lurker at this sight, and now with the purchase last week of 2010 S MC Sportline, a fellow Maserati fraternity member. I thought I would try and clear up some of the information (and misinformation) in this thread (and others) on the engines needing attention with the varators and retrofitting of the associated oil pressure check valve. This issue was something I took into consideration when searching for 'The Right' driver quality GTS.

I've attached a copy of the service bulletin from Maserati to the dealers on the issue, and subsequent repair. I have been a 30 year technician, and have spent the last 3 years working at the manufacture level as a Technical Service Manager for a region with 68 dealerships. I've had to read through and decipher hundreds of safety / product improvement campaigns over the years, and sometimes they can be convoluted and confusing when translated to English.

On page 4 the bulletin states as follows

" The 4.2 litre and 4.7 litre engine with serial number:
• 148697 onward, are already equipped with the new anti-back flow oil valves and the present Bulletin should not apply.
• 150070 onward, are already equipped with the new timing variators and with the new anti-back flow oil valves and the present Bulletin should not apply."

So it really has nothing to due with the year and month of manufacture. These engines are completed, then shipped to the factory and stored until needed. Then, as the cars are assembled, an engine is assigned, recorded and installed during the build. My particular GT, is engine # 161XXX, so I knew it was factory corrected with the oil check valves, and updated varators. If your car has the warranty paper work packet, the engine number is listed. The engine number is also very easy to see by jacking up the unit, and looking up on the driver's side rear by the cat, a very clear stamping on the block pad. In my particular case, build date was June of 2010, so some of the dates I've seen thrown around on the web mean nothing as to effected units.

Hope this helps other new potential owners of these sexy beasts, make educated purchasing decisions and pricing consideration
Click to expand...
---thx for this great insight. I have a video I would like to send to you of my 2018 Gran Turismo's cold start "clatter". I tried to post it on this reply but NO luck, must be me. Anyway, my direct email is jamtoolmaker@msn.com and if you could advise me on how to send the video to you directly, I would be most thankful. Jay [toolmaker]
 
#105 ·

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thoughts on the sound of my cold start? Not sure if it’s just the fuel injectors ticking and the normal camshaft noises. Thinking of doing the cam cap job soon DIY.
 
#106 ·
Sakyubasu said:

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That is variator rattle for sure on startup...Just doing the caps isn't the entire job and will be hit or miss...J
Click to expand...
 
#109 ·
Different deal...That is a dry sump engine and they often sound like that and it really doesn't get worse so that is about normal...Yours is gonna get worse and get louder and louder and last longer....Jason
 
#110 ·
Basco said:
A 2012 should have the modifications from the factory. I just installed a fuel pump bypass switch that allows me to crank the engine to build oil pressure without the engine firing off. I use it for the first start in the morning after the car has been sitting. I’ve noticed much smoother starts with less noise when the engine has been “primed”. Mine is a 09’ so I’m trying to get oil into the variators before starting. As for your oil leak, a mirror and flashlight is your friend. It’s obviously getting on your exhaust somewhere so look for stains or burnt oil on your headers. Cam covers are a likely culprit.
Click to expand...
How much did it costs you for the fuel pump bypass switch? Is it hard to do it?
 
#112 ·
kissthebricksdad said:
This is repetitive, but okay, some don't check former threads. Post-Sept 2011 has the factory fix. Whether you have the Owners Manual or not. Shame on all of you who sold this stuff on ebay instead of passing it on to the car's next owner.
KTBD
Click to expand...
I realize this is 5 years old but...where is 9/11 coming from? Everyone else has quoted 9/10
 
#114 ·
67rschev said:
Hello all first time poster here. I've been a long time lurker at this sight, and now with the purchase last week of 2010 S MC Sportline, a fellow Maserati fraternity member. I thought I would try and clear up some of the information (and misinformation) in this thread (and others) on the engines needing attention with the varators and retrofitting of the associated oil pressure check valve. This issue was something I took into consideration when searching for 'The Right' driver quality GTS.

I've attached a copy of the service bulletin from Maserati to the dealers on the issue, and subsequent repair. I have been a 30 year technician, and have spent the last 3 years working at the manufacture level as a Technical Service Manager for a region with 68 dealerships. I've had to read through and decipher hundreds of safety / product improvement campaigns over the years, and sometimes they can be convoluted and confusing when translated to English.

On page 4 the bulletin states as follows

" The 4.2 litre and 4.7 litre engine with serial number:
• 148697 onward, are already equipped with the new anti-back flow oil valves and the present Bulletin should not apply.
• 150070 onward, are already equipped with the new timing variators and with the new anti-back flow oil valves and the present Bulletin should not apply."

So it really has nothing to due with the year and month of manufacture. These engines are completed, then shipped to the factory and stored until needed. Then, as the cars are assembled, an engine is assigned, recorded and installed during the build. My particular GT, is engine # 161XXX, so I knew it was factory corrected with the oil check valves, and updated varators. If your car has the warranty paper work packet, the engine number is listed. The engine number is also very easy to see by jacking up the unit, and looking up on the driver's side rear by the cat, a very clear stamping on the block pad. In my particular case, build date was June of 2010, so some of the dates I've seen thrown around on the web mean nothing as to effected units.

Hope this helps other new potential owners of these sexy beasts, make educated purchasing decisions and pricing consideration
Click to expand...
mcsportline said:
ok guys.
Thanks to this video

I think I have finally figured out what those cylinder-looking parts are.
These are "OIL PRESSURE CHECK VALVE" with item number 296016
www.eurospares.co.uk

Eurospares are the worldwide number 1 supplier of the complete range of new and used Maserati GranTurismo (2009) 4.7 F1 parts Rh Cylinder Head 004

Eurospares are the worldwide number 1 supplier of the complete range of new and used Maserati GranTurismo (2009) 4.7 F1 parts Rh Cylinder Head
www.eurospares.co.uk www.eurospares.co.uk

Question:
Are these parts necessary for replacement too?
My GT has been experiencing "startup rattle" like everyone else.
Only difference is I have seen that most people usually experienced it during cold start, while mine mostly happened
after engine has been running for a while.
For example, driving about 5km to gas station, turning it off, starting it up again, then here comes the "rattle".
Click to expand...
mcsportline said:
ok guys.


can you tell us all more about the
Thanks to this video

I think I have finally figured out what those cylinder-looking parts are.
These are "OIL PRESSURE CHECK VALVE" with item number 296016
www.eurospares.co.uk

Eurospares are the worldwide number 1 supplier of the complete range of new and used Maserati GranTurismo (2009) 4.7 F1 parts Rh Cylinder Head 004

Eurospares are the worldwide number 1 supplier of the complete range of new and used Maserati GranTurismo (2009) 4.7 F1 parts Rh Cylinder Head
www.eurospares.co.uk www.eurospares.co.uk

Question:
Are these parts necessary for replacement too?
My GT has been experiencing "startup rattle" like everyone else.
Only difference is I have seen that most people usually experienced it during cold start, while mine mostly happened
after engine has been running for a while.
For example, driving about 5km to gas station, turning it off, starting it up again, then here comes the "rattle".
Click to expand...

very interesting fix, can you tell the forum members more about those oil pressure valves in the video--did that stop the rattle. thx
 
#117 ·
Just a question here, as I will have to do mine soon. The previous owner did the cam caps mod, but did not change the variators. I think he thought it would be okay, but I occasionally get the dreaded nose - not every time though.

How long can you ignore them for? If the noise is not there every cold start, can I wait a month or two? Which at my current usage would be 5-800 miles.
 
#119 · (Edited)
Looking for some help. 2008 Gran Turismo , had the rattle Fitted new ocv LH bank Still rattled. Unplugged them, rattle stopped EML on , bought 2 new ocv plugged them in without fitting them (left the original ones in) rattle stopped, no EML, car running absolutely fine. move on around 4 months. EML back on even though nothing has physically changed. Decided to change things about, LH bank ocv is now connected and loose RH is plugged in, no rattle but EML comes on after about 5 or 6 minutes. Code P0011 (no signal) is it possible that the ocv has broken because it was not actually plugged in ? Or do I have another problem. Hate this car. Rear speed sensor just gone AGAIN too. Any help appreciated.
 
#120 ·
I'm looking at a 2010 Granturismo. The car was produced in May of 2010 (before the Sept 2010 date referenced earlier in this thread).

But the engine number us 160,683 per the dealer (who told me the engine number when I gave them the Vin).

Safe to assume it has the updated variators?
 
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