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Thread: radiator fan mount wear

  1. #1
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    radiator fan mount wear

    Went for a 300 mile blast on the bike and thought how lucky I was to have a fairly trouble free Trail...Then saw a tiny pool of coolant under the front of the bike. Had noticed the fan coming on which was unusual, especially as the bike wasn't overheating. After investigation, realised rad was leaking from two of the three fan mounting points. Decided to flush the rad which was perfectly clean. Against my better judgement, I stuck in a bit of Radweld which has stopped the leak. After a bit of googling, seems this is a not an uncommon problem on Aprilia's. Someone suggested putting rubber washers between the rad and the fan mounting bolts. Anybody tried this? No way I'm paying 300 quid for a new rad and don't really wanna send mine off to a refurb specialist while the sun is shining. Thinking maybe coating the sides of the rubber washers facing the rad with epoxy before tightening up might make a reasonably permanent fix.

  2. #2
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    Having had a chance to clean and dry the whole rad before cranking up again, I'm pretty sure the two leaks are not coming from the fan mounts. They appear to be lower centre and low offside. The radweld hasn't stopped them completely but they are more like small damp patches now so I'm hoping it will hold over the summer and I can send the rad off to a repairer in the winter.

  3. #3
    apriliaforum expert dobbi's Avatar
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    I've never heard the fan mounting holes causing the problem. look carefully on the lines of the rad core from left to right and you are likely to find the hole.

    running it fulll of warm water will easily show it up on the front where the damage could be either hanging stress or impact. (rad guard prevents this).

    If damage is coming from rear you will have more likely than not got a hanging strss fracture. put as many washers on the bottom rad mounting points as you can and still get the top bolts in.

    to find a hole on the rear, remove the rad, pretend you are Paul McCarney and blow through one of hte holes of your peace pipe and see where you get a toot. If your head blows up, then you must have been imagining it. Or it need to go to an engineer who can pressure test it.
    “If it looks like a duck, and quacks like a duck, we have at least to consider the possibility that we have a small aquatic bird of the family anatidae on our hands.” Douglas Adams

  4. #4
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    Thanks Dobbi, sound advice. I came across the mounts causing wear on another Aprilia forum, forgotten which bike but it wasn't the Peg. I can't see any stone damage but there are two leaks at the front. Back seems OK. After a second run, the radweld seems to have taken hold and stopped them both for now. I put rubber washers on the lower rad mount a while back and stuck one on the easy to reach fan mount today just for good measure. As long as it gets me through the summer, I'll have it tested and repaired over winter. Having seen the replacement price, a rad guard is on my 'to do' list.

  5. #5
    apriliaforum expert dobbi's Avatar
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    Glad that you have got a good handle on it. My very sledgehammer approach to sealing the rad with chemical metal has had no diference to the rad performace. one line was sealed and all good after 10k miles
    “If it looks like a duck, and quacks like a duck, we have at least to consider the possibility that we have a small aquatic bird of the family anatidae on our hands.” Douglas Adams

  6. #6
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    After considering a DIY grille, decided to order this:

    https://rover.ebay.com/rover/0/0/0?m...2F123802464826

    If I've got my measurements right, this should screw straight onto the plastic side protectors. I'll post pics when it's installed.

  7. #7
    apriliaforum expert ytc1's Avatar
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    Quote Originally Posted by glopro View Post
    After considering a DIY grille, decided to order this:

    https://rover.ebay.com/rover/0/0/0?m...2F123802464826

    If I've got my measurements right, this should screw straight onto the plastic side protectors. I'll post pics when it's installed.
    Lets us know how it goes, being a lazy git, it would beat going down to B&Q and cutting up chicken wire again
    A square Peg in a round hole - http://ytc1.blogspot.co.uk/

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    Will do. Usually takes a couple of weeks for cheapo Chinese shipments.

  9. #9
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    So I installed the cheapo Chinese rad guard today. This is what came in the package:

    Click image for larger version. 

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    I cut off the four mounting lugs and drilled two holes for mounting directly to the plastic rad end guards. I also cut out a hole for access to the mounting cover screw on rhs (opposite side to reservoir).

    Click image for larger version. 

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    To mount it I took off both rad end covers and bolted the radguard to them. You could use self tapping screws but I decided to bolt mine on. If you use self tappers you won't even have to take of the rad guards. To protect the rad, put some thin wood behind the plastic guards when you drill the mounting holes.

    Click image for larger version. 

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    Quite pleased with the result. Easy to do, should protect the rad and looks OK as well. Total outlay less than £14.

  10. #10
    apriliaforum prov-nov
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    Super job that and nice pics. Could do with that when I head to the Pyrenees in Oct.

    I'll get one ordered.

    This is the link you posted, so I assume that's the one.

    https://rover.ebay.com/rover/0/0/0?m...2F123802464826

    Cheers
    Rich

  11. #11
    apriliaforum expert dobbi's Avatar
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    Nice one, does the job and looks good too.
    “If it looks like a duck, and quacks like a duck, we have at least to consider the possibility that we have a small aquatic bird of the family anatidae on our hands.” Douglas Adams

  12. #12
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    Yes that's the link. Apart from the delivery wait, couldn't fault it.

  13. #13
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    Quote Originally Posted by glopro View Post
    Yes that's the link. Apart from the delivery wait, couldn't fault it.
    Brill and thanks.

    I'll get one ordered.

    Rich

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