Instructables
Picture of Oil Filter Wrench for Tight Spaces
This is a home-crafted oil filter wrench for tight spaces on modern automobile engines.  It is made from an old piece of 1/2 inch black iron pipe and a pipe end cap.  Also used is some discarded bicycle chain.  The wrench is operated by a 3/8 inch drive socket ratchet.

The chain tightens its grip on the oil filter as the pipe twists when pressure is applied to the ratchet handle.  
 
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Step 1: Commonly available filter wrenches

Picture of Commonly available filter wrenches
 These common wrenches do not always fit the space available on an automobile.  The end cap style (center) sometimes should fit a particular filter, but does not.  Sometimes no end cap wrench is available for a particular filter.  The wrench described in the Instructable can be made to fit whatever filter your car uses. 

Step 2: Drill the end cap for the ratchet

Picture of Drill the end cap for the ratchet
 Drill a 3/8 inch hole in the center of the end cap for the ratchet.

Step 3: Square the hole

Picture of Square the hole
 Work carefully with a small file to make the round hole square so the ratchet will fit into it the way the ratchet fits into a wrench socket.

Step 4: The ratchet in the hole

Picture of The ratchet in the hole
 Here you see the ratchet's square end partially inserted into the hole in the end cap.

Step 5: Mark the pipe for drilling holes

Picture of Mark the pipe for drilling holes
 I stuck a piece of masking tape onto the pipe for marking where to drill holes for the chain.  I considered using three pieces of chain and made the markings, but later decided on only two.  Also, use a pipe wrench and a vise to screw the end cap onto the pipe as tightly as possible.  That should be sufficient to keep the end cap from unscrewing when pressure is applied by the ratchet.  

Step 6: Drill holes in the pipe

Picture of Drill holes in the pipe
 The size of the holes you drill will depend on the size of the chain you use.  My chain was 9-speed chain for a 27 speed bicycle.  I needed holes just a little larger than 3/8 inch.  Drill the holes through both sides of the pipe, upper and lower.  

Step 7: Fit the chain to your filter

Picture of Fit the chain to your filter
 Slip the end of the chain through one set of holes and wrap it around an extra copy of your oil filter.  Note which pin in the chain to use when opening the chain. 
3366carlos1 year ago
great
Phil B (author)  3366carlos1 year ago
Thank you.
mgalyean3 years ago
Brilliant and simple. Well done.
Phil B (author)  mgalyean2 years ago
Thank you. I am sorry I did not see your comment until now.
miska_man2 years ago
I'm still confused how this actually works. Is there a chain tensioner inside the pipe? Maybe I'm just looking at this wrong, but I can almost always figure something out in an Instructable.
Phil B (author)  miska_man2 years ago
There is nothing inside the pipe. Each piece of chain passes through a hole in each side of the pipe. Each piece of chain is a closed loop sized for the filter. When the ratchet wrench turns the pipe the chain wants to wrap itself around the pipe, which has the effect of shortening the chain around the filter and makes it very tight on the filter. The only thing the force of the ratchet can do once the chain is tight around the filter is to twist the filter on or off of its threaded stud on the engine, depending on which direction you are pulling the ratchet. I hope this helps. Thank you for looking.
Ah I understand it now. Very simple. Thanks for the help.
Phil B (author)  miska_man2 years ago
I am glad to have been of help.
Izzy Panzer2 years ago
Really nice and handy tool that is rather easy to built. Great idea and great work.
Phil B (author)  Izzy Panzer2 years ago
Thank you.
lemonie4 years ago
I like the double-action, useful indeed I should think.

L
Phil B (author)  lemonie4 years ago
 You are quite correct.  The chain pieces tighten around the filter as easily whether installing or removing the filter.  

One of my goals was also to make this without any welding, even though a little welding might have made some steps easier.   No welding means more people can make use of it.

Thanks for your comment.
lemonie Phil B4 years ago
You can buy wrenches like this, but not with two chains as I remember. Beats whacking a screwdriver into it, which is another way...

L
Phil B (author)  lemonie4 years ago
My wife drove a Subaru Forester for several years.  It used an odd size filter for which no standard wrench fit.  This would have been handy for that car, had I thought of it then. 

I thought only shade tree mechanics in the USA drove a screwdriver through the filter in hopes of turning it loose.  I did not know people in the UK had fallen to our low standards, too.
lemonie Phil B4 years ago
Oh aye, it's a classic, after all you throw 'em away don't you?

L
but its really messy it makes a real mess out of your clothes and pavement
Yes I know, that was the original point.

L
u are right but sometimes u gotta do what u gotta do eh

Oh yes, you do, that's true.

L
Phil B (author)  lemonie4 years ago
 The screwdriver method has not worked well for me.  First, there may not be a good angle for pounding the screwdriver into the side of the filter.  Then I may not have enough room to make the filter turn.  I am apt to mangle the filter badly so that I cannot get a good hold on it later with any tool.  At the start I had an intact filter difficult to remove.  Later I have shards of a filter I cannot grasp and it is still difficult to remove, but there is no tool that will work at that point.  
rimar20004 years ago
Smart and simple idea, Phil.

I never used a chain tool. I just put the chain on a piece of wood, and using a steel awl or nail and a hammer I hit the pin I want to extract. Once loosened a bit, I complete the task by replacing the wood with a nut whit a hole which is a little larger than the bolt.
Phil B (author)  rimar20004 years ago
Thank you, Osvaldo.  Your method of breaking a chain apart works.  A chain tool is not very expensive and makes the job easier.  A chain tool is also nice to have with you when riding your bicycle some distance from home.  Twice I had a chain break while I was out riding.  Once I had a chain tool and was on my way again quickly.  The other time I did not have a chain tool and pushed my bike home.  
once my bike chain broke and i did sometjing not really bright and i welded it wrecked the chain i had to look for another chain just for being lazy for not putting the link back in
To err is to learn, do not complain.
yes correct you are very correct i should really think more positive and learn from my mistakes
Leon Close4 years ago
This is a really good idea. The filter on my SEAT is really difficult to get to. I once saw a mechanic use a tricky ratchet driver attachment. It had three prongs which tightened in on the filter as the driver was turned, worked very well.
Phil B (author)  Leon Close4 years ago
 Thank you.  What your mechanic used would be an interesting challenge to make at home.  The design presented in this Instructable requires common household tools, very available materials, and no welding.  
That's why I like it so much. This is a very slick design, thanks for sharing.