Okay, so i have a 88 tii and i got my engine rebuilt by a professional rotary shop and i'm having issues with it. First its a full rebuild with seals gaskets and bearings. the rotors and housing are in good condition( thats what they said) i had to replace the rear housing and rotor though due to apex seal damage, also i had my irons lapped. Now the issue is the after 1200 miles the compression is still low, really low actually. On a factory mazda compression tester it shows about 6.4 front, and rear is 6.3...... which means i need a rebuild right? i babied the car, never going above 3.5rpm and never went into boost. Change my oil at first 100miles, then 500, then 1000. I'm using premix also.

I took it to the shop and they said to drive it another 1000miles or so because it could be the bearings still breaking in and stuff.... but i really don't think its going to change much. A new rebuild with all new seals is suppose to have compression around 9 right? What do you guys think????? They are good people and i really don't think they are trying to screw me, but i don't think another 1000 miles will change the compression that much.

 

Who rebuilt it? What did they rebuild? Where did they rebuild it? When did they rebuild it? Why did they rebuild it?

 

don't want to say because of reasons, but they are very reputable. they did a full rebuild on my car like i said above. and they rebuilt them because i need them too.

 

If this top secret company is reputable, they will not hesitate to make good on their rebuild.

Save all receipts, document all communication and mileage, and follow their break in specifications. After that, comp test and contact them again, knowing 100% where you stand.

If there is an issue, justifyably posting your account on the forums can add some leverage
+ lawyer if necessary.


john ny

 

^^ +1

Do what they say, drive it another 1000 miles or so, and if the problem persists, take it back.

 

Depending on apex seals used, it may take a bit for them to seal properly against the rotor housings.

Go another 1000 miles, as long as you're within warranty, which you haven't mentioned if you have.

 

is the car having hot start problems?

 

the only reason why i don't want to mention the name of the shop is so people don't think differently about them. also, i do have a warranty on the rebuild.... i year unlimited miles, just not on apex seals.

I don't have hot start problems.... just cold.

 

I'd say drive it another 1000 miles and vary your driving style a little. If I were you, I'd drive it harder this time for sure, maybe not full boost or redline? but definitely a lot harder than never surpassing 3.5k rpms. My understanding of a break in procedure was not to baby it, but to drive it at varying speeds and various loads, but not neccesarily full boost or redline until you get to 1000 miles. maybe i'm wrong about that though. Did you check the compression with the engine hot and and the throttle body propped open?

 

Must be Mazdatrix in OC or Orange County Ca.

 

its not mazdatrix

 

yup... when i did the compression test, they used a genuine mazda compression checker, engine was fully warmed up and i held the throttle open when cranking

 

You finish break in yet?

john ny

 

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yn nhoJ

 

yes i finished with the break-in, and its the same. i'm going to have to take it back to the shop

 

Alright, let us know what happened. Oh, and PM pics. of the sweetie in your avatar.

 

I'd beat it like a red headed step child before bringing it back, what do you have to lose!

 

^^
I am in 100% agreement.

 

Yeah +2!
After my first engine let go at 3800 miles, and was babied for the first 2500.. I ALWAYS BEAT THEM. 50 miles Break-in FTW

On a serious note, when i get 300 miles to a tank. the break-in is over. It's the tale-tell sign it wants boost.

 

well, i have an update on the rebuild. I took it back and they said that all the coolant seals and gaskets on the irons and the housings were shot, so they thought that it was leaking so it wasn't compressing. That didn't work, they put new gaskets and seals on and still it wasn't any good. Now they are going to put on different rotor housings. I just hope that they remember that they need to put more torque on the irons and housings since they were lapped.