Hi There,

 

I have a 2015 MK 7.5 Fiesta Zetec S 1.0 Ecoboost 125ps which has had a wet belt failure. When looking at fords options for wet belts i have 2 options (18.1mm width belt Red writing on belt) or (16mm V ribbed belt use only blue writing on belt) . I was wondering which one would be the correct option for my car as Im going to be rebuilding the engine rather than buying a new one.

 

Cheers

26 minutes ago, Stewyb368 said:

Im going to be rebuilding the engine rather than buying a new one.

Save your time and money. Attempting to rebuild a 1.0 EcoBoost engine never ends well. 🙁

No matter how carefully you rebuild it, the likely hood is that it will fail in less than a thousand miles. If you are looking for a low cost fix then buy a used engine from a scrap yard.

5 minutes ago, unofix said:

Save your time and money. Attempting to rebuild a 1.0 EcoBoost engine never ends well. 🙁

No matter how carefully you rebuild it, the likely hood is that it will fail in less than a thousand miles. If you are looking for a low cost fix then buy a used engine from a scrap yard.

Would it be the wet belt that usually goes after a rebuild?

1 minute ago, Stewyb368 said:

Would it be the wet belt that usually goes after a rebuild?

Not usually. Failure after rebuilds are due to many things, here are a few, but not in any particular order:

• Turbo Failure
• Engine failure due to oil starvation
• Blocked oil galleries
• Cylinder head failure
• Over heating
• Inlet manifold problems.
• Oil pump failure
• Big end failure

These are only a few of the reasons. Also some parts are actually not available as spares since Ford consider the bottom end to be 'unserviceable'

A brand new genuine Ford engine can be bought for £2990 or can be supplied and fitted for £3300. A used engine can be found at a scrap yard for £800, possibly less.

If getting a replacement engine be sure to get the correct one there are different types of 1.0 EcoBoosts

1 minute ago, unofix said:

Not usually. Failure after rebuilds are due to many things, here are a few, but not in any particular order:

• Turbo Failure
• Engine failure due to oil starvation
• Blocked oil galleries
• Cylinder head failure
• Over heating
• Inlet manifold problems.
• Oil pump failure
• Big end failure

These are only a few of the reasons. Also some parts are actually not available as spares since Ford consider the bottom end to be 'unserviceable'

A brand new genuine Ford engine can be bought for £2990 or can be supplied and fitted for £3300. A used engine can be found at a scrap yard for £800, possibly less.

If getting a replacement engine be sure to get the correct one there are different types of 1.0 EcoBoosts

I appreciate the helpful input but I'm just looking to get the car back on the road, I've ruled out any damage to all bottom end parts and block i just have 6 bent valves due to the engine loosing timing as approx 10-15 teeth sheared clean off the belt. I'm just looking for input on which would be the correct belt to buy as I'm unsure. I will be replacing oil pump as it is clogged aswell as clearing out as much belt material from within the engine as possible.

2 minutes ago, Stewyb368 said:

I've ruled out any damage to all bottom end parts and block i just have 6 bent valves due to the engine loosing timing as approx 10-15 teeth sheared clean off the belt.

I wish you well if you try to rebuild it, but I fear that things will not go according to plan. As regards which belt you need, I'd wait until you strip the engine and see what is fitted.

@RayC333 has personal experience in rebuilding an EcoBoost 1.0, he should be able to advise of the possible issues that you will encounter.

The 18,1 mm wetbelts are installed on a Fiesta produced before production date 09-02-2013.
The 16 mm wetbelts are installed on a Fiesta produced from production date 09-02-2013 up to production date 08-12-2019

The 16 mm and 18,1 mm wetbelts however are interchangeable since the pulleys and tensioner are identical.

The reason why Ford reduced the width of the wetbelt is unknown. Knowing Ford it was may well have been just a cost cutting measure (10 x 16 mm belts instead of 9 x 18,1 mm belts out of the same amount of material). 


Good luck rebuilding this engine.

Rebuilding these engines is not rocket science but a quality rebuild can easily equal the cost of a replacement (new) engine from Pumaspeed. As already said Ford considers the bottom end to be unserviceable and therefore does not supply any internal parts or service information for the bottom end.

How do you know for example that the crankshaft bearings are still OK if you do not know the prescribed clearances and tolerances?

Once the valves have interfered with the pistons there is a substantial chance of additional damage that may not be directly visible at this point. Same applies for a (partially) clogged oil pump.

Of the many attempts to save these engines very few were actually successful on the longer term. The highest chance of success will be a full top to bottom rebuild. 

 

I believe that the Belt size was made narrower because swelling of the Belt over time contributed to the Belt failure, hence the narrower one had more room to swell before it caused a problem.

I fully agree with all the other above comments that the others have made though, I think you are wasting your time trying to rebuild the Engine.

20 hours ago, Tizer said:

I believe that the Belt size was made narrower because swelling of the Belt over time contributed to the Belt failure, hence the narrower one had more room to swell before it caused a problem

Yes that was indeed it. There's an article about it somewhere that I was sure I had bookmarked but I can't find it.

PSA released a tool (literally just a fixed-width double pronged gauge) for their wet belts as one way of helping determine belt degradation. If the belt doesn't fit it needs changing.

To @Stewyb368, I'd go for the narrower belt regardless which is currently fitted.