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Replace Oil Filler Cap Every 12K?


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#1 dunkyb

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Posted 24 March 2020 - 07:45 PM

Read it was necessary to replace the fuel filler cap every 12K miles?!

 

My MPI seems to have a non-standard rocker cover and cap, like the one pictured below.  Does anyone recognise this type of cap and should it be fine without being

replaced?!

Cheers!

 

mpi.png



#2 timmy850

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Posted 24 March 2020 - 08:39 PM

If you read the original owners manual, it was part of the servicing requirements as the cap is vented to allow the engine to breathe. If you have a chrome cap like that you can check it’s not clogged and give it a good clean and it should be fine

#3 Moke Spider

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Posted 24 March 2020 - 08:49 PM

As Timmy touched on, it's only the vented caps that need to be replaced (and I think you are referring to the Oil Filler cap here?) as the filter in them clogs up.

 

The type you have there are bad news in my books. There's an open hole in the middle of the cap with no filter at all ! No need to replace them as there's no filter to clog !!  I bounced one guys at pre-trip inspection from coming on the trip one of these rocker covers for this reason. He promptly sold the rocker cover.



#4 RustyAutoCityE

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Posted 24 March 2020 - 09:17 PM

Thank you for posting this topic, I had no idea that the standard Oil filler cap was considered a service part. Always good to learn new things.



#5 dunkyb

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Posted 24 March 2020 - 09:38 PM

Hi Timmy / Moke Spider,

Many thanks! Yes I did mean oil filler cap, I’ll try and edit the topic title.

Would you recommend I get hold of a standard rocker cover and cap then?

The only reason I found this is the car is a tiny bit spluttery on starting after being left for a few days, so was looking at breather system etc. (Once fired it’s fine!)

#6 Cooperman

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Posted 25 March 2020 - 12:34 AM

I have that type of rocker cover, but I have a vent pipe and vent tube going to an oil catch tank under the LH front wing. I use a standard plastic rocker cover cap.



#7 dunkyb

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Posted 25 March 2020 - 12:45 AM

Cheers guys. What problems may I see by keeping with this setup? (It’s how I got the car a few months ago...)

#8 timmy850

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Posted 25 March 2020 - 04:05 AM

It will depend on how the breathers are set up on your car. If the breathers are going to the inlet manifold via a PCV system, then the cap works like a source of intake air for the engine and it will bring in any dust or contaminates and add them into the oil.

On my car when I used one of this particular caps and with open breathers it would expel air via the cap, which should be less of a problem?

#9 dunkyb

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Posted 25 March 2020 - 09:27 AM

I'm not too sure what kind of breather system it is, I assume the standard that was fitted to the 1275 MPI engines (1998).  Doesn't look modified in any way.  Is it a 'closed loop' system I believe

if that helps?  Do I need to change any filters or maintain the system at all?

 

It was checking this that lead me to find about the filter in the oil filler cap.






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