General Miata Chat A place to talk about anything Miata

New Motor with rebuilt head. Diesel tapping noise heard from the head

Thread Tools
 
Search this Thread
 
Old 04-28-2012, 11:04 PM
  #1  
Senior Member
Thread Starter
iTrader: (3)
 
Rushin's Avatar
 
Join Date: Jul 2008
Location: Minneapolis, MN
Posts: 963
Total Cats: -1
Default New Motor with rebuilt head. Diesel tapping noise heard from the head

Just put in a freshly built motor. 1.6l, scat rods and super tech pistons, rebuilt head.

Here is a video of the noise


Noise is louder when the car is called.

First oil chage was at 100miles, replaced with 5x30 castrol regular oil.

Any idea what the noise could be?
Rushin is offline  
Old 04-28-2012, 11:23 PM
  #2  
Elite Member
 
nitrodann's Avatar
 
Join Date: Apr 2010
Location: Newcastle, Australia
Posts: 2,826
Total Cats: 67
Default

Having not watched the vid, Im guessing a dry lifter.

Watching vid now.

Yeah Im sticking with dry lifter.

Dann
nitrodann is offline  
Old 04-29-2012, 12:42 AM
  #3  
Elite Member
iTrader: (4)
 
hornetball's Avatar
 
Join Date: Mar 2008
Location: Granbury, TX
Posts: 6,301
Total Cats: 696
Default

Couldn't really tell much from the video.

Lifter tick is a characteristic of these engines.

There have been instances where cam caps were not properly torqued (there was even one member who broke his exhaust cam because of this). Worth checking.

Once you've broken the motor in, Rotella T-6 FTW. You really want to be running a synthetic due to the temperature of the bearings in the turbine.
hornetball is offline  
Old 04-29-2012, 10:01 AM
  #4  
Senior Member
Thread Starter
iTrader: (3)
 
Rushin's Avatar
 
Join Date: Jul 2008
Location: Minneapolis, MN
Posts: 963
Total Cats: -1
Default

Can I loosen all the cams and torque them again?
Rushin is offline  
Old 04-29-2012, 11:01 PM
  #5  
Elite Member
iTrader: (4)
 
hornetball's Avatar
 
Join Date: Mar 2008
Location: Granbury, TX
Posts: 6,301
Total Cats: 696
Default

Sure. Do a bolt at a time. It's good to know for sure. The guy that had the camshaft problem had just gotten his head rebuilt.
hornetball is offline  
Old 04-29-2012, 11:15 PM
  #6  
Senior Member
iTrader: (8)
 
FowlerMotorsports's Avatar
 
Join Date: May 2011
Location: Granbury, Tx
Posts: 813
Total Cats: 14
Default

Sounds like a dry lifter, mine sounded like it was about to blow and that I had no oil pressure but once warmed up its quiet. But cam bolts are a maybe, I just use a 1/4" ratchet and tighten by feel, I think a torque wrench is over kill sometimes. I had a cam bolt snap once when it was torqued to 10ft/lbs using a torque wrench
FowlerMotorsports is offline  
Old 04-30-2012, 09:25 AM
  #7  
Junior Member
iTrader: (4)
 
05pearl's Avatar
 
Join Date: Jun 2008
Location: Colorado
Posts: 344
Total Cats: 8
Default

May also want to verify that your valve shims are within spec.
05pearl is offline  
Old 04-30-2012, 01:36 PM
  #8  
Elite Member
iTrader: (13)
 
falcon's Avatar
 
Join Date: Dec 2009
Posts: 2,499
Total Cats: 16
Default

Yeah, because hydraulic lifters have shims.

n00b.
falcon is offline  
Old 04-30-2012, 04:38 PM
  #9  
Junior Member
iTrader: (4)
 
05pearl's Avatar
 
Join Date: Jun 2008
Location: Colorado
Posts: 344
Total Cats: 8
Default

^oops, my build made tapping sound due to out of tolerance shims and I had to re-do them - :redface:
05pearl is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Full_Tilt_Boogie
Build Threads
84
04-12-2021 04:21 PM
Corky Bell
Prefabbed Turbo Kits
18
11-22-2016 09:01 PM
shooterschmidty
Engine Performance
8
09-30-2015 10:28 PM
ihiryu
General Miata Chat
9
09-28-2015 10:22 AM



Quick Reply: New Motor with rebuilt head. Diesel tapping noise heard from the head



All times are GMT -4. The time now is 05:41 PM.