kensmw Posted November 30, 2016 Report Share Posted November 30, 2016 Hi, I would like some advice on fitting a replacement remote servo unit. I have bought and fitted a powertune aftermarket unit and it has made no difference at all to the feel of the pedal. The instructions say it must be connected via a vacuum hose to a suitable vacuum source e.g. the engine induction manifold or vacuum pump. It says on some vehicles the manifold is already tapped and fitted with a removable plug, otherwise it will be necessary to drill and tap the manifold. I would need to order the relevant adaptor, pipe and in line non-return valve, the adaptors come in three different sizes 1/8 BSP, taper. 5/8X16 Whitworth, and 5/8 UNF thread. Where would the connection go and what size adaptor will I need. I would presume the inlet manifold is what the carbs are attached to, this is referenced as Stanpart 311749 although it looks to me that the front of the manifold has a tube connected to the bottom of the water pump and the back of the manifold is connected to what I think is the heater unit and off the bottom of that is another tube returning under the exhaust manifold to the water pump. Is the manifold a duel unit, having water running through the top of it and the underneath section the inlet, separated in the casting. If this is the case where would be the best place to drill and tap it. Any help would be appreciated, photos or advice on other peoples experience with these, as you may gather I am not a mechanic and this is my first project. Thanks Ken Link to comment Share on other sites More sharing options...
GT6M Posted November 30, 2016 Report Share Posted November 30, 2016 https://www.google.co.uk/search?q=triumph+GT6+servo+pictures&client=firefox-b&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwix-I_czdDQAhVqBcAKHesrDKAQsAQIIw&biw=984&bih=573&dpr=1.25#imgrc=jyGnoSh5-JD5aM%3A there should be a blank plug,or its oready been used by engine breather it wa fitted to a llate mod GT i had, totally useless, binned it v v soon brakes ed nee feel, pedal was spongey, and it took alot of room up on bulkhead, just where me Cuppa now sits wen workin on engine The cars fitted wid a servo, had bigger MCs t,try an get pedal movement lower it did,nt wuk v well, So, if ye got the smaller MC 5/8th as opposed t,the 3/4 MC, then yer pedals gonna move even further. esp if yer on bigger rear cyls too. as 5/8th had smaller rear cyls too,if i can recall Note, all servos will mek pedal spongey, lots of travel, just like all moderns pedals move a country mile Can meb,e try a 2 PSI RPV on frunt brakes, and a 10 PSI ont rears as it,ll help wid pedal travel most,if not all moderns ev em already fitted into their MCs noo https://www.google.co.uk/search?q=residual+pressure+valves+for+brakes&client=firefox-b&source=lnms&tbm=isch&sa=X&ved=0ahUKEwigoIiQ0dDQAhVIIcAKHYGsA6wQ_AUICSgC&biw=984&bih=573 not wot yer wantin to hear, but, me self, Bin it. M Link to comment Share on other sites More sharing options...
dougbgt6 Posted November 30, 2016 Report Share Posted November 30, 2016 Ken, Here is a picture of the GT6 inlet manifold from the Canley Classics web site. http://www.canleyclassics.com/triumph-gt6-mkiii-manifolds-and-pipes This manifold has the vacuum connector part 149487 and was fitted from when the Servo became standard on the GT6 in February 1973. You have to follow the fitting instructions carefully for the servo to work correctly, for instance the servo slave cylinder at the correct angle, the U trap in the vacuum line. Most servos have an internal one-way valve but I don't know your one. My own replacement servo had a poorly fitted one-way valve so I added an external valve, nice chrome job from a Jaguar! Link to comment Share on other sites More sharing options...
dougbgt6 Posted November 30, 2016 Report Share Posted November 30, 2016 From GT6M's post I can't be sure, but I don't think he likes servos! I would only point out that if your car was fitted with a servo as standard and you dispose of it, that's an MOT fail. Link to comment Share on other sites More sharing options...
kensmw Posted November 30, 2016 Author Report Share Posted November 30, 2016 Thanks , have just checked and there is a blanking plug where part 149487 is shown in the link. Will check out Canleys. Job for the weekend, Thanks for the quick reply .Appreciate the help. Link to comment Share on other sites More sharing options...
GT6M Posted November 30, 2016 Report Share Posted November 30, 2016 Nope, no a MOT fail, https://mattersoftesting.blog.gov.uk/5-things-our-customers-ask-us-about-mot/ I want to fail a particular item on a modified vehicle. Is there any allowance for this?Where a vehicle has been extensively modified or converted, Reasons for Rejection for components missing where fitted as standard should not be applied. For example: a car converted for rally use (i.e. rear seats removed and fitted with a roll cage and full harness seat belts etc.) may have been converted so as not to require a brake servo or power steering a car converted to a stretch limousine may no longer be fitted with curtain airbags AND, it only applies to AT time of test for other things too. Butt, yes yer correct, they totally useless brakes, or moer to the point, pedal feel an feed back M Link to comment Share on other sites More sharing options...
dougbgt6 Posted December 1, 2016 Report Share Posted December 1, 2016 You are talking about an "Extensively modified vehicle" On a standard car, like mine is and I suspect Ken's, If the servo was fitted as standard and you've taken it off, that's an MOT fail. I've had this discussion before and some say how would the MOT man know you've removed it? Well, mine spotted that I'd changed my knackered old Girling servo for a new Lockheed type. So they know. He also told me that the servo doesn't actually have to work, it just has to be there! I didn't quite believe it so checked it out and section 3.6 says, check servo for presence, condition of vacuum pipe and leaks. Fail if servo absent, pipes deteriorated, leaks. But, no mention of it actually having to work! My pedal feel and feedback are fine, I suspect you had the original Girling which aren't very good even when new. Link to comment Share on other sites More sharing options...
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