1987 300 SDL 160000 NEW G-PLUGS INJECTORS,STILL RUN RUFF FOUND COMPRESSION LOW IN #1 CYLINDER...I HAVE GOOD COMPRESSION EXCEPT FOR 1 ,,THE #1 CYLINDER IS LOWER BY 50LBS I GET THE SAME READING AFTER INJECTING OIL INTO CYLINDER,ALL OTHER CYLINDERS APPEAR TO BE GOOD..I ASK YOU GUYS WHERE DO I GO FROM HERE,I SHOULD HAVE ASKED THIS BEFORE REPLACING ALL OTHER PARTS..NOW VALVE PROBLEMS??? IM WORRIED!..THANKS FOR ANY HELP RICK

50 lbs is not a huge difference. What were the compression numbers. if your around 325psi or maybe a little lower it is fine. Its not optimal but will do.

__________________

Chris
84 280sl
82 300d euro

Did you do the compression test with engine hot or cold? These are the spec for the OM603.

Service manual specs:
=====================
Normal pressure: 26-32 bar 377-464 psi
Minimum pressure: approx. 18 bar 261 psi
Permissible difference between cylinders: 3 bar 43 psi

It is not too far off from the spec if it is 50psi lower than the adjacent cyl. 3psi is within the margin of measurement errors. I managed to bring cyl with 50 psi and 100psi back to 300psi. So do not worry.

__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.