Basic Kit DTM
Type IV and Porsche Conversion Instructions

Please read BEFORE starting the conversion. It is assumed the person/s carrying out the procedure is a qualified mechanic. If you have questions, call us before getting started!

  1. Long block prep
      1. Remove and save the three oil cooler studs
      2. Remove and discard stud at the oil filler opening on engine case (Type 4 only).
      3. Remove all cast flashing on top of engine case.
      4. Remove the four blower housing retaining studs.
      5. Remove the two top long bolts on the case.
      6. Fold over or grind off the four corner lips of the oil cooler so it is square.
      7. Clean the oil cooler
    2. B. Install the Type I "press-in" nut found on the late ('71 -up) cases. The nut is located on upper left mounting hole where the transaxle joins the engine case (NOT INCLUDED IN KIT). Install the nut in the same location on your Type 4 or 914 case. Enlarge the existing hole with a file and gently press in the nut. Use Locktite. Excessive force will crack the case.
    3. Using the bail pivot holes on both sides of the breather tower as a target, drill a 5/16"hole through both sides of the breather tower. Use a shop rag in the tower to catch the metal filings. Vacuum out the filings and THEN remove the rag. Do not let the contaminants into the engine.
  2. Installing the shroud onto the long block
    1. Disassemble the shroud components. It has been shipped assembled to familiarize you with how it will be assembled in your engine. The fasteners are NOT held tight intentionally. When re-assembling the oil cooler housing to the shroud, use Loctite on the 4 oil cooler housing bolts. Note that the two long shroud retaining bolts are ¼-28 thread. The rest are ¼-20.
    2. Install the shroud brace with air separator towards the right. Install the two braces to case retaining bolts with the nutted ends on the left side. Slide the shroud over the shroud brace. All the aluminum components of the brace remain IN the shroud. Then install the two long bolts using the internal spacers (ferrules). Install the third short bolt.
    3. Install the oil cooler air housing. Install the four bolts through the oil cooler air housing shroud and internal air guides. Note the upper and lower air guides. Install the oil cooler dipstick adapter (Type 4 only). On 914 cases, bend the stock dipstick tube slightly to the right to clear the generator stand and use a flexible automatic transmission dip stick cut to the same length as the stock dip stick. Install upper oil cooler adapter directly to the oil cooler. Install the two 36" oil lines BEFORE the oil cooler is inserted into the oil cooler housing (to avoid breaking the housing). Add the retainer spring THROUGH the oil cooler (not over it) to hold it in place.
    4. Install the Gen/Alt stand to the generator or alternator. Shape the generator strap so it resembles an inverted "pear" with the opening at 2 o'clock. Install the steel mounting block in the breather tower. Slide the strap on loosely. With the stand and alternator together, install them on the engine. Rotate the backing plate to align the four shroud screws. Dress the top of the tower with loc Loctite 518 "Gasket Eliminator". Install the two stand retaining screws. Align the stand and tighten down all six screws. Tighten the generator strap. Install the fan belt and adjust with shims. Retighten after one hour of run time.

The engine may now be test run on the stand or on the ground.* When installing the engine in a Type I, remove the gen/fan/stand assembly intact. Remove the crank pulley, dip stick adapter and carburetors intact with their manifolds to reduce possibility of clearance problems during installation. The engine may be installed intact in an open engine vehicle (rail, dune buggy, Baja) or an early Type 2 with a removable rear apron.

*Test running an engine prior to installation is practiced by the best mechanics. It permits leak checks, easy visual inspection, cam break-in cycle, cool down, first valve adjustment and first engine oil drain prior to installation.

Note: Use ONLY high pressure rubber sheathed oil hoses. Steal braided hoses will chafe shroud and destroy its appearance.

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