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Thread: Engine Broke 2.7 Post.

  1. #71
    As I have commented...the order of the rocker shafts was lost...I have looked at them and they are fine...I think there is no wear...I did not intend to touch the camshaft but with the book in hand it says clearly that if you plan to reuse the rocker shafts or buy new ones... You must maintain order or in the event that the rockers were new, the camshaft would have to be polished, otherwise it would cause greater wear on the shaft. Being at this point, where I have no order in the rockers. I find myself obliged to polish the camshafts, correct? Even if they are in good condition... Having lost their order... is correct polishing ?

  2. #72
    Regarding the car that this engine comes from, I have a doubt. Having the engine number and knowing that it corresponds to the year 74... What relationship does it have with the 911 SC? The Sc began to be manufactured in 78? If this were so, I have a doubt... At home there has always been a 911SC logo from the vehicle to which the engine belonged. This has always confused me and now I want to ask... Is it normal for a vehicle to have the "911SC" rear logo and this engine?
    Part #: 911 559 337 01
    +
    the studs that join the block are magnetic.
    +
    I've been checking the chain tensioner... They look like the standard 2.7 ones. The sprocket I think also although it has a number that I have to see well... On the other hand the chain casings... It's a noob question but the numbers do not coincide with those in the book. I'm sure I'm looking at it wrong or something I don't understand because I think that the chain case is also the standard one. I have to "take" the probability that this motor is a replacement. A "standard" replacement without any modifications?
    And in that case... This motor initially came with an 11-blade fan? Or should I have the 5?
    Last edited by _gonbau; 07-03-2022 at 04:47 AM.

  3. #73
    I do not understand this. when I picked up the cylinder heads they had removed two guides from one of the heads.... this is the state in which they give them to me and he asked me if this "deformation that can be seen in clean metal" in the mouth of the valve guide It is normal...? I understand that not. But is it a modification or bad practice on the part of the workshop? If it were the latter, I would not understand how a workshop with so much experience and in such a simple job could have done this. I've tried looking for detailed photos of this but I can't get much.IMG_20220701_175732.jpg

  4. #74
    member #1515
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    You have to make sure the shop has experience on aluminum heads. I had a Porsche dealer once crack three of my heads when they put in new guides. They then charged me for three new heads. It is a friction fit so they must be reamed to the exact dimension for the new guides.
    Trying to do this piecemeal is going to cause you headaches. The shop has to take responsibility for the whole process, cleaning, guides, valve seats grinding calve seats, lapping the valves in, setting springs. They should give you the fully assembled heads.
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs

  5. #75
    umm I didn't want to get into it but the job they had to do was supposed to be the one you mention. I took the assembled parts to them so that they could disassemble them correctly and reassemble them correctly. Once they were disassembled, I was supposed to go find them to clean them myself... and return them to be assembled... when I picked up the work....have I noticed that my pieces have been taken as practices? From what I have seen, despite being a grinding machine from 1960, do we not know how to work these cylinder heads? what they return to me is everything disassembled, without any order... one camshaft was outside and the other was left inside the casing (did they get bored at the end of so much disassembly?)... then I look, I see that they only took out two guides of valves when they had to remove them all... I start to observe and what I see is that... as if someone who had no fucking idea had worked on it and this has made me quite angry. one goes with a good attitude, eager to learn and turns to people who charge for their work or to receive this? From ignorance I think that this was not a correct way to proceed... now I see myself in the situation of... either continue with these people who I doubt too much, look for another one or try to see how difficult it is to extract the guides . I have the invoice for the work that was supposedly going to be done for me, so I left the pieces there. included everything you say RS. but when I pick up things, what they give me is this... so I am at this point and I prefer to be honest with this... others would keep this information... greetingsIMG_20220621_132316.jpg

  6. #76
    Baudett, you need to find a machine shop that specializes in Porsches. There was no one in the state of Oklahoma where I live that was capable of rebuilding my heads. Fortunately I was only a 4 or 5 hour drive from Ed Mayo’s shop in Texas so I took them there. Many here in the US are sending their engines across the country to have them properly machined. Surly you can find a specialist in Europe to send yours to. You have already spent enough money with the idiots who didn’t know what they were doing to cover shipping charges. I understand shipping is very high right now, but so is having to purchase a new engine. Good luck.
    1969 911S
    1969 Datsun 2000...worth less, but more valuable

  7. #77
    member #1515
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    Pack up all your engine bits, find a good engine builder and send him the whole lot when you have enough money to cover the rebuild. It will be cheaper and less frustrating in the end. I am sure some of our euro members here can have recommendations.
    Fiddle with the bodywork all you want but get a proper engine rebuild.
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs

  8. #78
    Quote Originally Posted by RSTarga View Post
    Pack up all your engine bits, find a good engine builder and send him the whole lot when you have enough money to cover the rebuild. It will be cheaper and less frustrating in the end. I am sure some of our euro members here can have recommendations.
    Fiddle with the bodywork all you want but get a proper engine rebuild.
    that was the idea. The body can be "more to taste/technique" of the owner but the engine has to be perfect. I have always known that the path of the engine passes through the mechanic and not through my hands... I will inform myself about builders in Europe... in the same way I will try to give the workshops here one more opportunity. The former head of the Porsche house is still in his workshop, he went with my father to buy the car in the 80's and the other day we went by there to see what he had to say about the engine... I'll come back to him, I'll tell him about the problem I have had in the grinding machine and I will ask him who he works with. (Many Porsches are repaired on this island) and I don't believe that here they don't know how to do a correct valve guide job. I don't believe it or I don't want to believe it. Apparently I'm going to have to get into the world of workshops on my island to understand why a simple job becomes complicated. I have seen how the valve guides are worked on the 911 in the videos, how the measurements are taken, etc... It does not seem to me such a complicated job for a workshop that has the machinery. Is this correct right? With the book in hand, one understands a little more things... but I thought the book would be clearer with certain topics like this. When I read it I realize that the book I thought was something like "like the bible" is actually a "summary of the bible"...

  9. #79
    Quote Originally Posted by Theunz View Post
    Baudett, you need to find a machine shop that specializes in Porsches. There was no one in the state of Oklahoma where I live that was capable of rebuilding my heads. Fortunately I was only a 4 or 5 hour drive from Ed Mayo’s shop in Texas so I took them there. Many here in the US are sending their engines across the country to have them properly machined. Surly you can find a specialist in Europe to send yours to. You have already spent enough money with the idiots who didn’t know what they were doing to cover shipping charges. I understand shipping is very high right now, but so is having to purchase a new engine. Good luck.
    From my point of view... I have always had "envy" in the geographical area. Both at a Spanish and foreign level you realize that being here you miss many things.
    Regarding the losses... I have to check but that "fissure" or crack that is observed... I hope it is not such. If not a manufacturing defect? Or if or if it burst when removing the previous valve? I will try to assess the head better to see if it is totally lost.

  10. #80
    member #1515
    Join Date
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    Don't feel bad, even in the US there are few mechanics with the skills and machinery to execute a full rebuild in house, there are some, but they barely have any teeth.
    Most shops send the machining portion of engine rebuilds to a couple of specialists. Fuel injection pumps to two specialists, refinishing of wheels to maybe three or four.
    Brake calipers to one, upholstery to three or four, etc.
    Then they assemble the finished parts.
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs

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