Aren't the STs chain driven? I'm sure it was the early 1.0 ecoboosts (ecobooms) which had problems with the wet belts..

 

I’m none the wiser mate
I’m a dinosaur I really need to get in touch with the 21st century. Rather than carbs and points and dizzys.

 

Looks like it is a chain, I was sure it was

MK8 ST Timing Chain

Hi everyone, I was wondering why Ford decided to go with a timing chain on the MK8 ST. I'm glad they did I was just wondering why they did it, with the 1.0s being wet-belts due to less emissions and less noise. The MK7 ST was a cambelt so would anyone know why they changed to a chain? And with...

www.fiestastoc.com

 

I went to the local garage to pick up a new boot liner for the Car, and when I came out I had a mechanic tell me to I should get rid of my mk8 st as those timing belts running through oil will cause lots of problems. Then he just strolled off which left me pondering. I’ve had a browse online but it’s turned up little info perhaps I’m looking at the wrong stuff.
Has anyone has any issues ?

I wouldnt worry, he was probably a VW fanboi or a German car owner at least, green round the gills etc etc !

 

The 1.0 ecoboost engine which started out in 2012 is the one with the wet belt. It runs through the engine oil. There have been some issues where material from the belt has blocked the engine oil pickup and hence starved the engine of oil. I read somewhere that this is worsened if you don't use an oil specially designed for wet belt engines.
The belt is supposed to last something like 10 years or 150k miles before it needs replacement - and it's obviously a big job. Due to a significant number of failures, you'll find some people recommend halving that service period.

The good news is the 1.5 ST engine, as has been summised above, uses a chain for timing.

 

The 1.5 Ecoboost 3 Cylinder Dragon Engine use a Little Timing Belt for the Oil Pump!!!!
In engine oil. Therefore regular Oil Change with the right Oil 5W-20 is important.
The crankshaft and the Camshafts are driven by a timing chain.

 

- inside the sump. Manual says it's the 180PS 1.5 Ecoboost which isn't the ST variant, but I've no reason to think the ST is any different.
I can't see anything about a replacement schedule though, which is not the case with the fibre timing belts.
Interesting...

 

You can believe me. Every 1.5 Dragon has Oil Pump Belt.

 

 

Gear driven on the ST...off the balance shaft..
It's in this link..

 

Summarising for the Dragon 3cyl 200ps engine.
Camshaft drive is via an oil immersed toothed belt from the front of the crankshaft.
Single balancer shaft and oil pump drive is gear driven from the rear of the crankshaft.

 

An explanation of what all this means to the uninitiated would be appreciated. 👍

 

Even the initiated are getting lost.

Cams are chain, only likely service item would be tensioner. That is the good bit. No cam belt to fail and write off the engine.

The oil pump is unusually a small belt in oil, probably a lower friction thing, but obviously could fail and cause oil starvation. But this should immediately bring up low oil pressure warning before any mechanical damage.

The rest of the serpentine belt is water pump, air con, alternator . .

 

As it seems, the only belt in oil is the small tooth belt (?) driving the oil pump and balance shaft.
Camshafts are driven from a chain and all other staff (ac, alternator etc) from a regular dry tooth belt

 

The ST has a timing chain and the oil pump is driven by the balance shaft via a gear off the crank there are no wet belts...

 

Are you sure? That's good news! Thanks

 

Better view of the balance shaft being gear driven the non driven side turns the oil pump...As i said above best check with dealers incase they changed to wet belt?

 

View attachment 591518
Better view of the balance shaft being gear driven the non driven side turns the oil pump...As i said above best check with dealers incase they changed to wet belt?

Only until 25.February 2019 built engines

 

Isn't that the 1.5 naturally aspirated dragon engine?

A close look at Ford's new 1.5L 3-cylinder Dragon Petrol Engine

A close look at Ford's new 1.5L 3-cylinder Dragon Petrol Engine

www.team-bhp.com

 

Yes the diagram is the naturally aspirated one (wet timing belt on that one) I posted that just to show the set up clearer than the haynes auto fix diagram.. If you look at the youtube link i posted above showing the turbo dragon fiesta st engine it shows the same set up gear driven off the balance shaft..The haynes autofix screenshot i posted shows the same aswell...I confirmed with a guy i know works in ford parts department at my local main dealer but as i said above mines derivative 2 my sons is 12 so newer ones maybe wet oil pump belt I doubt it myself but if anyone has any doubts they should just ask their parts/service dept at their dealers..

 

Oil pump belt from 25.February 2019 until now

Oil pump driven by gears from 7.5.2018 until 25.2 .2019

 

Thank You Jorg for the detailed answer!

 

Thanks, I think that clears everything up.
So my early 2018 engine is gear driven, makes me feel a bit happier.
I can't see the later model oil pump belt on any replacement schedule?

 

My ST3 was first registered on 24/4/2019. How can I tell if my engine has a belt-in-oil or gear driven oil pump?
Anyone known the VIN or engine number when they changed to BIO drive for the oil pump?

 

You must know the build Date of your car. And look for the outer appearance of your engine/of the front timing chain cover . The registration date is unimportant if you look for technical information.

 

This is so confusing. My engine is a Derivative 1 and the engine was built on 16/5/2019. It has 6.1 Litres of oil and the dipstick is 48.5cm long, but according to Mountune mine has a blow off valve as well, so it seems like mine is a Frankenstein car with some earlier bits and later bits. All i want to know is do i have a timing belt or timing chain 😄

 

Let's start at the beginning. 😅
Every 1.5 litre 3 cylinder engine has a timing chain for Crankshaft to the 2 camshafts. The interesting question is if the engine got a little oil pump belt or gear driven oil pump. Only few engines have the older construction with balancer shaft in Oil sump and Oil pump gear driven.
The majority of the engines have the newer construction with upper balance shaft, and belt driven oil pump.

 

Look at the timing chain Cover.

 

The engine build date is on the embossed square just the left of the x2 bolt on Jorgs diagrams above👍

 

Just to continue the oil pump belt discussion, I stumbled across the following when I was browsing the service schedule for the ST -

• Oil Pump Belt -- Every 150 000 miles/10 years - Renew (LTS 21 716 5) Vehicles built from 02/25/2019 only

So it appears there is actually a replacement interval specified for this belt. And I have to say it looks like a pig of a job.
The belt is driven by the crankshaft, so there's quite a few steps to being able to get it off -
Starting at the bottom, -
1) Remove the undertray
2) Remove the sump
3) There's a cover over the oil pump drive - take this off then you can slide the belt off the toothed pulley on the oil pump
Then we're on the front of the engine -
1) Remove the auxiliary belt and then the crankshaft pulley
2) Remove the timing chain cover
3) Take the timing chain off so you can get the timing pulley off the crank
4) Remove the balancer shaft drive pulley
- that gives you access to the oil pump drive pulley, so you can get the belt off.

Reassembly is the reverse 🤣 - including setting the cam timing etc.
There's lots of single use parts to bin (plus seals and gaskets), and after 150 k miles or ten years, you might as well think about other bits to replace.

That lot is going to cost a few quid unless you do it yourself. I wonder how much Ford would charge and how many people won't bother.
@Jorg - do you know how many hours the Ford system suggests for this job?

Cheers,
MarkP

 

Might as well replace timing chain while you're there

 

Late to the party on this thread, but Ford themselves may have caused confusion here. When the Mk 8 ST was launched, I downloaded the technical specs from media.ford.com (2018FordFiesta_ST_TechSpecs_EU.pdf).

This said: "Camshaft drive: Low friction belt in oil with dynamic tensioner"

I have just downloaded what seems to be the current version (FordFiestaST2021_TechSpecs_EU.pdf)

This now says: "Camshaft drive: chain driven with hydraulic tensioner"

 

We talk about the 1.5 litre Ecoboost I3 Dragon Engine. It has Definitivly a Camshaft/Crankshaft Chain.
But: the Engine Oil Pump Drive is separately!!!
Driven by a little wet belt. Please read all of the comments in this thread, and look at all of the pictures!!!

 

Yes, I was very surprised to find that incorrect information from Ford back in 2018 and reassured myself by checking as many other sources as possible. Obviously they have corrected the document since. Many thanks for your own input on this thread which is very informative.

Shame about the oil pump drive though. I still have memories of the ease with which you could remove the externally mounted pump on the "Kent" engine!😀