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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 06-04-2009, 07:23 AM   #1 (permalink)
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Need an idiot proof explanation on how to do an oil change on a 71 bonneville I just inherited. The haynes manual doesn't give any details etc. Also is missing the dipstick in the toolkit. Does the oil in frame resevoir drain when you drain the motor or is that seperate. Please , a simple detailed explanation would be a real help. Also need to know position of the air control lever on the handlebar once the bike has warmed up.
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Old 06-04-2009, 08:01 AM   #2 (permalink)
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Just remove the plug at the bottom of the motor - it's in the center of a square plate which is held with four nuts [that plate can and ought to be removed to clean out the strainer since the bike is new to you].
Think the dipstick is, or should be, attached to the oil-fill cap, sort of hangs there. Think many broke off and sit at the bottom of the resovoir.
The gearbox and clutch have separate oils that need to be drained. The Haynes ought to explain all this.
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Old 06-04-2009, 10:26 AM   #3 (permalink)
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for the OIF; to drain the oil remove the plug/bolt at the bottom of the reservoir, then remove the sump plug in the base of engine.

The sump plug has a screen that is easily cleaned, don't loose the washer. To clean the reservoir screen remove the four retaining nuts, remove the plate then pull out the screen. The two gaskets will probably need replacing so have them before you start. Clean the gasketed surfaces.

Reinstall the sump plug with crush washer in the engine. Install the reservoir plug with crush washer in the base plate, it's easily stripped so be careful with the wrench. One gasket goes between the frame reservoir and the screen and the other goes between the screen and the base plate. tighten things up and put in the oil. Check for leaks, start and let run a minute. Top up to within 2 inches of the opening.

The air control lever or choke is not needed at normal operating temps. If the engine runs rough with the choke closed, the choke cable may need adjusting.

Good luck and have fun with the bike.
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As it is, Andy
'78 Triumph Bonneville T140E
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Old 06-04-2009, 10:37 AM   #4 (permalink)
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You will need to drain the oil reservoir...remove drain plug and then remove the square cover and filter. (as has been said).
It might be an idea to remove the hose which connects to the cover, and let the contents drain.

Next/also remove the sump plug/filter...the angled nut under the engine. Clean the filters with paraffin.
You ought to remove the oil pressure release valve, take it apart and clean it. Front right timing case.
And drain the primary chain case, nut at the rear of case.
If you are going to do it properly, re-fit all the above items, fill the oil tank/frame with cheap oil, pour a bit into the rocker boxes and check if the oil pump return is working by using the kickstarter (spark plugs out); oil should be seen squirting from the return pipe, looking in the oil filler.
Drain it again, fill up with the recommended oil, and that`s it.
Dont forget to pour 1/4 pint into the primary case.
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Old 06-12-2009, 06:25 AM   #5 (permalink)
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Appreciate everyones advice on the 1971 Bonneville and the oil change procedure. It was real helpful. An amazing bike- can't beat the look and the feel of it. Been wanting one of these bikes for years. Has only 6200 miles on it and has survived without modifications.
NH Bonney
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Old 06-12-2009, 02:09 PM   #6 (permalink)
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Dipstick

Hi NHB,
The dipstick on the 71 was separate to the the filler cap, if you look into the tank you will see a little bar where it is meant to hang. The easiest thing to do is buy a later filler cap with the dipstick attached.

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Old 06-14-2009, 09:09 AM   #7 (permalink)
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Quote:
Originally Posted by Webby View Post
Hi NHB,
The dipstick on the 71 was separate to the the filler cap, if you look into the tank you will see a little bar where it is meant to hang. The easiest thing to do is buy a later filler cap with the dipstick attached.

Webby
Webby.

Hey thanks for that piece of information as the tool bag/dipstick is missing with my 72 Tiger! In looking for parts, I saw the filler cap/dipstick and was wondering if it would work.

Scott
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