General Miata Chat A place to talk about anything Miata

ticking/rattle under decel

Thread Tools
 
Search this Thread
 
Old 05-25-2010 | 06:41 PM
  #1  
cueball1's Avatar
Thread Starter
Elite Member
iTrader: (13)
 
Joined: Nov 2006
Posts: 3,875
Total Cats: 2
From: Tigard, Oregon
Default ticking/rattle under decel

With my engine build going on I've been neglecting the motor still in the car. I've been using the HLA ticking to know when to add oil. Well this time they never started ticking. Suddenly I've got a much louder ticking going on. I checked the oil and it was non existant on the dipstick. Arrgh.

Anyway the ticking/clacking/clanking noise is related to engine speed and only seems noticable under vacuum. Generally from 15-20 inches it rattles. Sounds like it's coming from the head and it's 3-4 times louder than the usual HLA noise. Engine runs strong though. No other symptoms other than the death rattle.

Stuck HLA? Piston slap? Broken whatsit? Any list of first and easy things to look at? Still have another couple weeks before I want to do the swap. Hoping to keep this one running a little longer.
Old 05-25-2010 | 06:46 PM
  #2  
wayne_curr's Avatar
Elite Member
iTrader: (8)
 
Joined: Aug 2007
Posts: 2,712
Total Cats: 4
From: Bellingham, Wa
Default

I would start by putting some oil back in that engine.
Old 05-25-2010 | 07:11 PM
  #3  
cueball1's Avatar
Thread Starter
Elite Member
iTrader: (13)
 
Joined: Nov 2006
Posts: 3,875
Total Cats: 2
From: Tigard, Oregon
Default

Damn. Hadn't thought of that one. I hear radiator stopleak quiets noisy lifters. Give that a try too?

Filled with oil. Let it idle a long time, have run it easy, run it hard, sound is still there.
Old 05-25-2010 | 07:14 PM
  #4  
wayne_curr's Avatar
Elite Member
iTrader: (8)
 
Joined: Aug 2007
Posts: 2,712
Total Cats: 4
From: Bellingham, Wa
Default

Should I have put an emoticon at the end of my statement to make sure you knew I was joking? There I did it that time.

Can an HLA collapse if the cam has been smacking it for a period of time with no oil in it? I know that a new engine will have ticking lifters for like 30 minutes or so.
Old 05-25-2010 | 07:14 PM
  #5  
Jeff_Ciesielski's Avatar
Elite Member
iTrader: (10)
 
Joined: Oct 2008
Posts: 1,770
Total Cats: 31
From: Rhode Island
Default

I'm going to take a super shot in the dark and say that you either:

1. Damaged a bearing and you are hearing a rod rattle around.
or
2. You wrecked a wrist pin and the sound you are hearing is the piston slapping around in the bore.
Old 05-25-2010 | 07:15 PM
  #6  
Jeff_Ciesielski's Avatar
Elite Member
iTrader: (10)
 
Joined: Oct 2008
Posts: 1,770
Total Cats: 31
From: Rhode Island
Default

Originally Posted by wayne_curr
Should I have put an emoticon at the end of my statement to make sure you knew I was joking? There I did it that time.

Can an HLA collapse if the cam has been smacking it for a period of time with no oil in it?
It could, but it would make the sound all the time, not just on decel.
Old 05-25-2010 | 07:16 PM
  #7  
wayne_curr's Avatar
Elite Member
iTrader: (8)
 
Joined: Aug 2007
Posts: 2,712
Total Cats: 4
From: Bellingham, Wa
Default

Originally Posted by Jeff_Ciesielski
It could, but it would make the sound all the time, not just on decel.
Good point. Sounds like something more serious then for sure.
Old 05-25-2010 | 07:19 PM
  #8  
NA6C-Guy's Avatar
Elite Member
iTrader: (1)
 
Joined: Feb 2008
Posts: 7,930
Total Cats: 45
From: Birmingham Alabama
Default

I'm also going with something crank related, one of the rod bearings or piston pins. Change in momentum in the moving parts create it, so I wouldn't think it would be related to something that spins with a balanced load like the crank, or cam shafts.

Symptoms sound much like when I heard when I spun a rod bearing. Very loud clacking, seems like it was only under vacuum early on, but eventually got worse over a few days until it was all the time loud clacking.
Old 05-25-2010 | 07:22 PM
  #9  
cueball1's Avatar
Thread Starter
Elite Member
iTrader: (13)
 
Joined: Nov 2006
Posts: 3,875
Total Cats: 2
From: Tigard, Oregon
Default

Originally Posted by wayne_curr
Should I have put an emoticon at the end of my statement to make sure you knew I was joking? There I did it that time.

Can an HLA collapse if the cam has been smacking it for a period of time with no oil in it? I know that a new engine will have ticking lifters for like 30 minutes or so.

I knew you were joking.

I also knew I was an idiot for not paying attention to the oil level closer. The idiocracy can run deep around here. Thus the stopleak reference in my reply.


Damn, I hate these doom and gloom replies. I may be swapping my motor sooner than I thought. I'm gonna pull the valve cover and look for anything obvious tonight.
Old 05-26-2010 | 01:41 AM
  #10  
Fireindc's Avatar
Elite Member
iTrader: (13)
 
Joined: Dec 2006
Posts: 6,841
Total Cats: 668
From: Taos, New mexico
Default

In my younger and dumber days I ran my engine almost 2 quarts low. How it survived and continues to run strong I do not know.

This motor also sucked up some rocks and one got lodged in the throttle body which made the engine rev even off throttle. After shutting off the car and cleaning the debris the car still runs fine to this day.

I guess these motors are really strong, or I'm just lucky.
Old 05-27-2010 | 12:10 PM
  #11  
cueball1's Avatar
Thread Starter
Elite Member
iTrader: (13)
 
Joined: Nov 2006
Posts: 3,875
Total Cats: 2
From: Tigard, Oregon
Default

You doom and gloomers will be happy to know you were absolutely right. The commute this morning I notice I'm running less vacuum on the freeway than usual. Look in the mirror and I'm smoking pretty good. Keeps getting worse, more smoke, less power all the way in. Park it and I've got oil pouring out from somewhere. Something broke loose and it's a goner. Thankfully the motor I'm putting in is fully assembled with the exception of some accessories. Just hadn't planned on swapping it this weekend.

Damn. I had better things planned for Memorial day weekend.
Old 05-27-2010 | 12:12 PM
  #12  
Jeff_Ciesielski's Avatar
Elite Member
iTrader: (10)
 
Joined: Oct 2008
Posts: 1,770
Total Cats: 31
From: Rhode Island
Default

Originally Posted by cueball1
You doom and gloomers will be happy to know you were absolutely right. The commute this morning I notice I'm running less vacuum on the freeway than usual. Look in the mirror and I'm smoking pretty good. Keeps getting worse, more smoke, less power all the way in. Park it and I've got oil pouring out from somewhere. Something broke loose and it's a goner. Thankfully the motor I'm putting in is fully assembled with the exception of some accessories. Just hadn't planned on swapping it this weekend.

Damn. I had better things planned for Memorial day weekend.
Sorry dude, I hate being right about **** like that :(. At least you had an engine getting ready to go in.
Old 05-27-2010 | 12:21 PM
  #13  
cueball1's Avatar
Thread Starter
Elite Member
iTrader: (13)
 
Joined: Nov 2006
Posts: 3,875
Total Cats: 2
From: Tigard, Oregon
Default

Entirely my fault though. Should have paid closer attention to the oil levels. Had been ignoring this motor since I had the other going in. Was hoping to have a good motor to sell off though when I made the swap, not a boat anchor only good for the recycler
Old 05-27-2010 | 12:25 PM
  #14  
hustler's Avatar
Tour de Franzia
iTrader: (6)
 
Joined: Jun 2006
Posts: 29,085
Total Cats: 375
From: Republic of Dallas
Default

Check the trans too. I've seen lots of transmissions die recently from low oil.
Old 05-27-2010 | 02:18 PM
  #15  
NA6C-Guy's Avatar
Elite Member
iTrader: (1)
 
Joined: Feb 2008
Posts: 7,930
Total Cats: 45
From: Birmingham Alabama
Default

Originally Posted by hustler
Check the trans too. I've seen lots of transmissions die recently from low oil.
*raises hand really high* Me! Me! Me!
Old 05-27-2010 | 02:38 PM
  #16  
curly's Avatar
Cpt. Slow
iTrader: (25)
 
Joined: Oct 2005
Posts: 14,497
Total Cats: 1,236
From: Oregon City, OR
Default

Thankfully he's got a spare 6spd too. Did you ever get that engine hoist? I just disassembled mine and brought it back from the GF's, it's available if you need it.
Old 05-27-2010 | 06:00 PM
  #17  
cueball1's Avatar
Thread Starter
Elite Member
iTrader: (13)
 
Joined: Nov 2006
Posts: 3,875
Total Cats: 2
From: Tigard, Oregon
Default

I ended up having Eddie at Adrenaline Racing do the swap. Things were slow at the shop and he gave me a hell of a price when I called him this morning. That way I should have the car up and running tomorrow afternoon and ready for the weekend. I couldn't possibly get it done that quick myself.

Well worth the price he gave me.
Old 05-27-2010 | 08:25 PM
  #18  
curly's Avatar
Cpt. Slow
iTrader: (25)
 
Joined: Oct 2005
Posts: 14,497
Total Cats: 1,236
From: Oregon City, OR
Default

Nice. In for results. We should go for a wine a cheese drive. And by that I mean beer and cheese sticks.
Old 05-27-2010 | 08:32 PM
  #19  
Jeff_Ciesielski's Avatar
Elite Member
iTrader: (10)
 
Joined: Oct 2008
Posts: 1,770
Total Cats: 31
From: Rhode Island
Default

You need to go on drives up north and stop living in the 3rd world .

Seriously though, we need to organize something over the summer.

Oh, and I'm excited to see the results.
Old 05-27-2010 | 09:48 PM
  #20  
cueball1's Avatar
Thread Starter
Elite Member
iTrader: (13)
 
Joined: Nov 2006
Posts: 3,875
Total Cats: 2
From: Tigard, Oregon
Default

We really need all the NW guys to get together at Pacific once and also at the new track ORP. ORP is absolutely fantastic and with Palatov you get 6-7 30 minute sessions in one day for $200. At the very least we need to tear up PIR on a Friday HPDE and follow it up with Friday night drags. JayL can testify it's a pretty good crowd for the drags.

Now I'm hoping I didn't screw something up in my motor build. Miss torquing one bolt, one gap too small or large, one screwed up piston ring, etc and it's all for naught! How's that for a glass half empty attitude!

Now that I'm not installing the motor myself like I'd planned I'll be able to tear into the other projects. BBK, bushings, 3.63 install, diff mounts, aero.



All times are GMT -4. The time now is 10:22 AM.