Hi All,
I recently took the decision to rebuild the engine on my 964. The main factor for this was oil leaks rather than lack of hp.
After much deliberation I decided to go with the Mahle 3.8 pistons and barrels offered by FVD. (Part No. 100 103 038 02: Mahle 3.8 L Piston&Cylinder Set - 964/993 (11.3:1) 107mm, narrow rod).
In addition, I have gone with their recommendation of using Carrillo rods (Part No. FVD 103 975 03: Carrillo 3.8 RSR connection rod set 23mm pin).
These rods are standard 964 big end size. Unfortunately, we have now encountered a small problem when preparing to fit these rods to my crankshaft.
The new bearing shells do not seem to fit properly with the Carrillo rods. To cover the basics; we doubled checked the part numbers with the manufacturers and both shells and rods are correct. In addition we have taken some measurements of the new rods and they seem to be in tolerance. When the shells are seated and the cap end fitted there is a misalignment on the outer edge of the shells. There is a visible discontinuity where the two shells meet (outer edges not flush). This then gives rise to a unacceptable tightness when the rod is placed on the crankshaft.
When the same shells are placed in the original rods they sit perfect; so this may suggest there may be a problem with the new rods rather than the shells? But we have not been able to confirm this yet. Possibly with the locating lugs? Does anyone happen to have a technical drawing for Carrillo rods?
We have been liaising with FVD and Carrillo before Christmas. They have been very reasonable and say they have never had this problem reported before. They have suggested that we send the rods back and they will send me out a replacement.
I am wondering if anyone has encountered a similar problem with either shells or rods. NB The shells are standard size Porsche items.
Any suggestions are greatly appreciated.
Cheers,
Ryan
I recently took the decision to rebuild the engine on my 964. The main factor for this was oil leaks rather than lack of hp.
After much deliberation I decided to go with the Mahle 3.8 pistons and barrels offered by FVD. (Part No. 100 103 038 02: Mahle 3.8 L Piston&Cylinder Set - 964/993 (11.3:1) 107mm, narrow rod).
In addition, I have gone with their recommendation of using Carrillo rods (Part No. FVD 103 975 03: Carrillo 3.8 RSR connection rod set 23mm pin).
These rods are standard 964 big end size. Unfortunately, we have now encountered a small problem when preparing to fit these rods to my crankshaft.
The new bearing shells do not seem to fit properly with the Carrillo rods. To cover the basics; we doubled checked the part numbers with the manufacturers and both shells and rods are correct. In addition we have taken some measurements of the new rods and they seem to be in tolerance. When the shells are seated and the cap end fitted there is a misalignment on the outer edge of the shells. There is a visible discontinuity where the two shells meet (outer edges not flush). This then gives rise to a unacceptable tightness when the rod is placed on the crankshaft.
When the same shells are placed in the original rods they sit perfect; so this may suggest there may be a problem with the new rods rather than the shells? But we have not been able to confirm this yet. Possibly with the locating lugs? Does anyone happen to have a technical drawing for Carrillo rods?
We have been liaising with FVD and Carrillo before Christmas. They have been very reasonable and say they have never had this problem reported before. They have suggested that we send the rods back and they will send me out a replacement.
I am wondering if anyone has encountered a similar problem with either shells or rods. NB The shells are standard size Porsche items.
Any suggestions are greatly appreciated.
Cheers,
Ryan