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Quattroporte III catch-all thread

Discussion in 'Maserati' started by Quattroporte3, Jun 27, 2011.

  1. thecarnut

    thecarnut Formula 3

    Apr 22, 2006
    2,460
    Atlanta
    Full Name:
    The Car Nut
    It means take a strong drink because you are most likely in for a lot of pain, both financially and mentally.

    Ivan
     
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  3. jamespeter26

    jamespeter26 Rookie

    May 9, 2019
    41
    Rome, Italy
    Full Name:
    Peter
    A piece of advice: start by draining that 40 oil you have in there, and replace it with a good 15W-50, otherwise any measurement you take will be inaccurate. This will help do the troubleshooting in the correct order.

    Oil pressure is created by resistance to flow. It is the same phenomenon as when you put your finger on the tip of your garden hose: water shoots out due to increased pressure, which is created by a resistance (your finger). Flow doesn't vary (faucet opening) but pressure does increase. Now, your engine oil pump is calibrated to flow at a particular rate, the exact number doesn't matter but think of it as liters or gallons of oil per minute (at a given RPM, this flow rate will increase with RPMs). This is a permanent spec of your oil pump. Now there are several things that will resist flow and create the pressure. One of these things is oil viscosity. The more an oil is viscous (higher grade), the more it will resist flow, thereby generating pressure. Another thing is the clearance between engine internals. Inside the engine, oil slides between various parts (camshafts and tappets, crankshaft and bearings, pistons and cylinders, etc.). The thinner the clearance between these parts, the harder it will be for oil to flow. Other things can cause pressure to go down: an oil filter imperfectly tightened, a leak somewhere, etc.

    Now the normal pressure range, corresponding to the values I mentioned in my previous post (1.5 to 5 kg/cm2), results from the combined action of three different components: your oil pump, which has a determined flow rate by RPM, the oil grade (or viscosity), and the cumulative resistance of all the engine internals. If any of these things isn't working as it should, pressure will be impacted.

    Now you need to find what exactly is causing your particular issue. If you have worn rod bearings, clearances will be higher than they should (by a fraction of millimeter) thereby opposing a slightly lower resistance to flow, and possibly causing mechanical damage to other parts. That's Negroni bad, and if this is what you have, you will need to investigate how bad it is to determine the best course of action. But for the moment, nothing tells us this is your problem and I'm inclined to think that it is not this, because you mentioned that you are running 5W-40 oil. This will definitely cause pressure to go down.

    Start by putting in 10W-50 or 15W-50, then hook up a mechanical gauge. This is done by removing the electronic pressure sensor (right next to the oil filter) and screwing the gauge in that same hole. Do this with the engine not running of course, then start your engine and take two readings, one at idle, another one at 3000 rpm.

    Edit: this is a good reading on the same topic: https://www.melling.com/wp-content/uploads/2017/03/pressure-vs-flow.pdf
     
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  4. Woods

    Woods Rookie

    Apr 6, 2020
    14
    New Mexico, USA
    Full Name:
    Eric Van Horn
    I have 4 big bottles of 15/50 on the way. Conveniently the car takes 2.64 gallons and the containers are 1.32 each. I'm not sure I thought 5/40, maybe that was for my other Quattroporte which is 2011. I now have the service manual, the regular manual, and the parts catalog, so I plan to make a better show of it going forward. This car didn't see much use, 22k miles, and mostly sat which can be bad in its own way. I had an Espada that sat for 14 years and Blew thick smoke for a few weeks and finally cleared up via Italian tune up method, at least this one doesn't do that! It's in pretty good shape, thankfully. I have seen some rough ones.
     
  5. jamespeter26

    jamespeter26 Rookie

    May 9, 2019
    41
    Rome, Italy
    Full Name:
    Peter
    Sounds great, please keep us posted. I found this thread about a similar problem with the same engine and the person solved it with a 20W-50 oil: https://www.ferrarichat.com/forum/threads/indy-4900-oil-pressure-problem.572989/ Also note that the car actually takes 11.5 to 12 liters of oil to reach the correct markers on the dipstick, this was reported by several owners and I confirm from my own experience.

    On a separate note, I wanted to let you guys know that I found a very nice replacement for the front seat belts. Original seat belts usually no longer work properly, retractors get stuck, webbings get dirty, etc. I’m aware that even when doing an originality-focused restoration, modern seat belts are often considered acceptable. I was actually willing to install a modern replacement, but it’s not so easy to find a suitable one due to the particular configuration of the buckle.

    For the most part, it’s a very ordinary 3-point system with retractor and anchor ring on the pillar. Webbing is black, which is most common. However, the buckle is rotated at a 90-degree angle relative to the mounting bracket, so that the buckle is parallel to the seat. In addition, the mounting bracket is horizontal, because it is bolted on the floor, but the cable is tilted 45 degrees relative to the horizontal plane. It’s a 9-inch black cable from the mounting point to the base of the buckle. If my description isn’t clear, the first pictures illustrates the original belt buckle. I'm also posting a photo with the label of my car's original belt.

    I’ll spare you the details of my research but that’s definitely not an easy-to-find configuration.

    However, I found that seat belts for Renault 14/Renault 18 meet these exact requirements, and R14s aren’t exactly a rare or exotic car. What’s more, I found a period-correct, brand new set of Klippan belts at the extortionate price of 110 euros for the pair (driver and passenger)! Klippan weren’t used by Maserati at the time, but if I’m not mistaken they were used by Ferrari as original equipment in vehicles of the same era. Their angular, yet elegant design makes them blend in perfectly in this car. Klippan is known for high quality and safety.

    The exact reference is KLIPPAN 5003042. If you can’t find them online, send me a PM.

    Original seat belt configuration
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    Original seat belt label

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    Replacement - Brand new Klippan 5003042 for Renault 14/18

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  6. Mexico074

    Mexico074 Formula 3

    Aug 14, 2008
    1,093
    Harriman, TN USA
    Full Name:
    Michael Demyanovich
    Very nice work on the Seatbelts! Also thank you for the parts number reference!
    Funny my 1972 Ghibli has Klippan seatbelts which I believe are original!

    Mike
     
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  8. Dave Burke

    Dave Burke Rookie

    Dec 1, 2017
    7
    Full Name:
    David Allen Burke
    Hi Folks,

    My '83 QPIII brake booster has given up the ghost. It is the Benditalia unit and the main diaphragm has split. I am looking to find a replacement part, rebuild kit, or failing that, a suitable replacement booster of another type. I would like to find something that mates up without my having to cut any metal. I also have gotten tired of giving my right leg the added workout of stopping the old girl!

    Thanks!
     
  9. boralogist

    boralogist Formula Junior

    Jun 21, 2005
    632
    https://www.okp.de/xtc2/Lamborghini/45-Brakes/Brake-boosters/Brake-booster-Bonaldi-Maserati-Lamborghini::20164.html?language=en

    ???
     
  10. Dave Burke

    Dave Burke Rookie

    Dec 1, 2017
    7
    Full Name:
    David Allen Burke
  11. boralogist

    boralogist Formula Junior

    Jun 21, 2005
    632
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  13. StanT

    StanT Formula Junior
    Silver Subscribed

    Oct 10, 2007
    343
    Vienna, VA

    Try mci@maseratinet.com, www.maseratinet.com. Good luck.
     
  14. Dave Burke

    Dave Burke Rookie

    Dec 1, 2017
    7
    Full Name:
    David Allen Burke
  15. boralogist

    boralogist Formula Junior

    Jun 21, 2005
    632
    Bendix part number for the diaphragm???
     
  16. Dave Burke

    Dave Burke Rookie

    Dec 1, 2017
    7
    Full Name:
    David Allen Burke
    Believe you me, they were one of the first that I contacted, and the master cylinder rebuild kit and master to booster seal arrived from them yesterday. Alas, they have none. So I am looking at rebuild services and am in contact with Apple Hydraulics to see what options they may have for me. I am quite keen to do this myself and if I could just find the diaphragm it would be an afternoon's chore. The breakdown of the booster is quite simple, and I was hoping that perhaps a diaphragm from another Bendix booster might work, seeing as how brake systems generally are not proprietary (why re-invent the wheel if you do not have to) but in this case it seems that I have run into a bit of a pickle!
     
  17. Dave Burke

    Dave Burke Rookie

    Dec 1, 2017
    7
    Full Name:
    David Allen Burke
    If I remember correctly it was B313671 LP (or B313761 LP) I scoured the interwebs last night and came up empty-handed.
     
  18. emsiegel13

    emsiegel13 Formula Junior
    Silver Subscribed

    Oct 9, 2007
    368
    Grayslake, Illinis
    Full Name:
    Elliot M. Siegel
    Have you tried Harmon Classic Brakes to see about parts?
     
  19. Dave Burke

    Dave Burke Rookie

    Dec 1, 2017
    7
    Full Name:
    David Allen Burke
    I sent them an e-mail, thanks very much for the suggestion! Worse comes to worst, they are pretty close to me in case I need to have the booster rebuilt. Otherwise I'll see if Apple can do it, or the guys out in Oregon. At the moment I am not in the greatest of hurries as I am chasing cancer on the hood and it will go to a body shop when that is done for the paint, but I love tooling around in that car. Next up is making some new suspension bushings and a couple of other sundry tasks. I also need to check the valve shims and timing chain tension. But she drives and rides really sweet and some friends and I took her to the Concours d'Elegance at Amelia Island in March and there are few cars I like more on a long road trip (my '57 Cadillac Sedan de Ville being one of them).
     
  20. BobS.

    BobS. Rookie
    Silver Subscribed

    Jun 21, 2019
    34
    Burbank, California
    Full Name:
    Bob Schmitt
    Hi -
    I joined FerrariChat more than a year ago on the advice of the former owner of my 1980 QP III. Also planned to advertise the car for sale. Not much luck here or eBay.
    I went ahead with rust repair (all metal) and paint, partly to help a friend with a shop when business was very slow.
    I just got the car back two days ago (Aug 31). I think all the work turned out well:
    http://1980maserati.com/
    I'll have better photos and a video soon. My ad from last year is still active - how can I delete and replace it?
    Any advice appreciated! Thanks!
    Bob S.
    Burbank
     
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  21. BobS.

    BobS. Rookie
    Silver Subscribed

    Jun 21, 2019
    34
    Burbank, California
    Full Name:
    Bob Schmitt

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