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series mm fan belt.
Posted: Sun Sep 25, 2011 9:56 pm
by bootlid
I recently purchased a new fan belt for my 1950 series mm sidevalve engine,in order to fit this belt i had to depress the dynamo fully until it lay on the engine,also i had to do away with the slide bracket which one would normally use to adjust the tension,it took quite an effort with two large screwdrivers and turning the starting handle to fit belt on to the two pulleys,is this normal procedure.??
Re: series mm fan belt.
Posted: Sun Sep 25, 2011 11:05 pm
by mike.perry
Maybe the fan belt was too short. The number for the long belt for the water pump is B33, does anyone know the number for the short belt?
Re: series mm fan belt.
Posted: Mon Sep 26, 2011 8:54 am
by bootlid
belt recently purchased from club spares,would have to cut belt off as removal would be impossible otherwise,dynamo solid no movement upwards possible.
Re: series mm fan belt.
Posted: Mon Sep 26, 2011 11:29 am
by bmcecosse
If it's too tight it will ruin the dynamo bearings..... It must not be 'taught'!
Re: series mm fan belt.
Posted: Mon Sep 26, 2011 11:51 am
by bootlid
Anyone out there got the right size of belt.
Re: series mm fan belt.
Posted: Mon Sep 26, 2011 12:20 pm
by bmcecosse
Is it just a normal V belt? Run a tape round it - with the adjustment set to the minimum and read off the length in mm.
Re: series mm fan belt.
Posted: Mon Sep 26, 2011 12:51 pm
by bootlid
no adjustment possible,dynamo lying hard on engine but will attempt to measure length and there is a number on belt,.
Re: series mm fan belt.
Posted: Mon Sep 26, 2011 1:48 pm
by mike.perry
What is the number on the belt?
Re: series mm fan belt.
Posted: Mon Sep 26, 2011 4:50 pm
by bootlid
markings on the belt,vulco b26 17x690 lp, i measured about 29 inches.
Re: series mm fan belt.
Posted: Mon Sep 26, 2011 9:47 pm
by bmcecosse
690 / 25.4 = 27.1"
I meant - put a tape round the pulleys when set as they would be with the CORRECT length belt fitted....... You obviously need something longer than that 690 belt.
Re: series mm fan belt.
Posted: Mon Sep 26, 2011 10:03 pm
by bootlid
thats the belt that mmoc club spares sold me two weeks ago,i agree that it is too small but what is the correct size of belt.
Re: series mm fan belt.
Posted: Mon Sep 26, 2011 10:21 pm
by WPR678B
!
Re: series mm fan belt.
Posted: Mon Sep 26, 2011 11:24 pm
by bmcecosse
Maybe your dynamo has a larger (than normal) pulley fitted?
Re: series mm fan belt.
Posted: Mon Sep 26, 2011 11:43 pm
by bootlid
i,ll check the pulley size and engine number,thank goodness its diesel day at bo,ness this weekend get my mind away from problems.
Re: series mm fan belt.
Posted: Tue Sep 27, 2011 12:42 am
by bmcecosse
You WON'T see me there then.......
Re: series mm fan belt.
Posted: Tue Sep 27, 2011 11:18 am
by bootlid
e.s.m are quoting a b27 fanbelt for the 918cc engine(without waterpump)
Re: series mm fan belt.
Posted: Tue Sep 27, 2011 4:00 pm
by bootlid
It turns out that i bought the fan belt from esm and not from club spares as i previously mentioned,i phoned esm today and they admitted not having the proper belt for a 918cc engine and just sent the next size(B26) which is too short,the B27 one they now list is not available.
Re: series mm fan belt.
Posted: Tue Sep 27, 2011 5:10 pm
by bmcecosse
Good grief..... they quite knowingly 'just sent you the wrong belt'....... great service there!
Re: series mm fan belt.
Posted: Tue Sep 27, 2011 5:59 pm
by bootlid
I am intending returning this b26 belt for a refund if i can get it off without damage.
Re: series mm fan belt.
Posted: Wed Sep 28, 2011 12:54 pm
by mike.perry
After some research by Graham Holt he has come up with a size of B27 for the short belt with an outside circumference of 30.25 in.
The large belt is B33 with an outside circumference of 35.5 in