Difference M139 and M145 both 4,7L

[Maserlove]

Hello together,

I would like to know what are the differences between both engines?

I´m searching for a spare one and they both look similar and both are advertised with 4,7L. Sometimes on Ebay are both codes mentioned for the same engine.

Is this really the same?

And are all Engines interchangable? Meaning a 2012 engine will fit a 2016 car in otherwise? Altough the have different HP? Is it the ECU which makes the difference?

 

[Gazcw]

Isn't 139 and 145 the platform numbers and the 4.7 in both is an F136Y?
I am aware of a difference on the auto v mc shift GT's. You cannot fit an auto engine and vice versa. So I am told by the more knowledgeable on here.
If the ecu is different I bet it will be coded to body computers also so there will be further pain.

 

[Zep]

There are detail difference between the engines in different models. For example an engine from an auto has different cam timing from a MC Shift. You are best off getting the same engine code, for example F136YK or from the same model, as this will guarantee it will work with the rest of the bits in your car.

 

[conaero]

Zep is correct, if its an auto, you have to fit the auto engine and same for MC Shift.

The crank and timing are different and do not interswap.

We have changed two engine only and both 4.7L Auto, here they both are from each end:

 

[giorgio01]

Would variator not adjust that depending on input from the ECU on the car?

 

[conaero]

No variators are different as is the crank

 

[Maserlove]

Thank you all for your feedback.

I will check the PN of the crankshaft and Variators, because I always thought the engine between both, Auto and MC Shift, are the same. And the Auto Version has some kind of Adapter between the block and the Transmission.

 

[giorgio01]

Thank you all for your feedback.

I will check the PN of the crankshaft and Variators, because I always thought the engine between both, Auto and MC Shift, are the same. And the Auto Version has some kind of Adapter between the block and the Transmission.

Yes, that's just an adaptor plate for the auto box but the same bolt pattern as the bellhousing for automated manual. I have an engine from 09 Granturismo auto mated to 6 speed manual via bellhousing from f1

 

[Maserlove]

I found a documentation about the Engines here: http://david.cratloe.net/201140074-ItM-2009-EN.pdf

And there on Page 305 are the different VVT Actuators mentioned.

So, when I´m buying a used engine where I have to look for the engine code? There should be some kind of stamp with F136Yx, shouldn´t be?

 

[Zep]

I’ve not seen the engine code on the block, as it’s the same block, it’s the heads that are different. It might be stamped on the heads. This is where the engine number is stamped, but sadly is of no help.

Perhaps stick to getting one from the right model.

 

[Maserlove]

So, if the heads and the variators are different, is the crank always the same?

If so, it´s mayble possible for me to source a engine block with a crank and pistons and swap my heads.

 

[Zep]

I suppose it depends on what is wrong with your current engine. If it has had oil starvation, the condition of the heads would also be suspect as the cams don't have bearings, they run direct on journals in the head, so repair is difficult to impossible.

I'd spend a bit of time on Eurospares looking at the engine parts by model to see if they are the same.

 

[Maserlove]

Is there anywhere anykind of documentation regarding the engine how to assemble it? I mean to do it in the right order and also all torque, clearance etc. specifications?

Thank you

 

[Maserlove]

Can anybody confirm that a engine with a M139 S stamp came from a Quattroporte S?

And can I be sure there was an ZF Auto attached to this block?

 

[Gazcw]

Can anybody confirm that a engine with a M139 S stamp came from a Quattroporte S?

And can I be sure there was an ZF Auto attached to this block?

They only did S in zf 6 speed.

 

[Maserlove]

That helps - thank you for this info.

There are not that many informations about it which engine code could be replaced by another unfortunely.

Is M145S interchangeable with M139S. Besides the difference in HP and Modelyear? 10Hp difference could be done by the ECU Flash...

 

[Maserlove]

I found a Document from the Maserati Academy with all necessary informations. Unfortunely for the F136UC-UD Engines.

I´m pretty there is anywhere the same for Yx engines with 4700cc. If anybody can help, please let me know.

 

[Maserlove]

Still searching....would also pay for the right document.

As I´m digging more and more, is it correct that there are no oversized pistons available? So if I have scratches in the sleeves I have to replace them?

Is anybody aware of any aftermarket parts like rod bearings, pistons etc pp? Or are these parts only available from Maserati and OEM?
I looked for example for Mahle pistons for this engine or pistons rings and can´t find anything except OEM. Does anybody here have experience regarding the OEM suppliers for Maserati where I can source some of the parts necessary or do I have to buy everything from Maserati?

 

[Zep]

I don’t know about sources for parts. But the key difference between the different engine types is in the cylinder heads with the variators, so if your issue is with the bottom end, you could use a donor bottom short engine and swap the heads.

What is actually wrong with your existing engine?

 

[Maserlove]

But then I will lose the matching numbers since the engine # stamp is at the bottom. This is something I want to avoid and keep the block.

The engine is stuck. Nothing happened to the valves or pistons, everything is on it´s place... So I think I have a bearing at the bottom end which is maybe welded to the crank... I will pick up an M139s engine tomorrow as a spare for parts and take this apart for practicing.

Also I will have then the liners and a crank. I will then remove the engine from my car and take all parts to a maschine shop for checking. So basically making one working engine out of 2.....