Hello. First time poster with a problem.

[kjgreen3]

Hello,

 

Im a proud owner of a stock grey import manual 6 speed 94 plate twin turbo black MIV (obviously cos im posting on here ) Supra.

 

Ok I have a little problem (yes yes I can hear you sighing), well its a big problem . I'll try to explain it in as much detail as possible. Here goes, My supra is currently back at the import place from where I bought it 14 months ago after last fridays incident (ill get to that in a bit). They say after a pressure test that all 6 cylinders are down on compression and number 6 cylinder is about 60% down in compression. It starts but wont rev above idle and that the oil level is low and dont know where its gone no leaks etc (i checked the level 3 weeks prior and it was healthy). Ive not noticed any leaks or oil light on, coolant levels were good and its been driving fine no change in performance up until the day (last friday) I did the following.

 

Reason for the dealers having my supra is due to this massive bad luck. Ok you may laugh. Noticed seepage from water pump friday morning checked coolant level was ok (much less than a litre down) so I topped it up and took it to my dads workshop to see if I could fix the leak. Checked coolant level when there (less than a pint lost) 60 miles away and car was driving fine up to my dads. So stripped rad fan etc out and then noticed water pump had cam tensioner on it so decided to live with the seepage until cambelt needed replacing for obvious reasons. Putting cam covers back on I dropped a small retaining bolt into the cavity behind the main crank pulley DOH!!!! So couldn't leave it but couldn't pull the bottom cover out enough to retrieve said bastard of a bolt. Hence main crank pulley removal (what a bitch that was) anyway got it off but had moved cambelt during process. So got bolt out and it was bent checked cambelt for damage and it was, so nipped out to get replacement. Fitted replacement put it all back together (locked cam pulleys together to stop movement and crank didn't move during cambelt replacement) and the car didn't start. No funny banging sounds compression sounded good (as starter still struggled as usual to spin the inline 6, didn't spin faster than usual basically) but no triumphant Vrrrrmmmm!!!. So decided to quit whilst behind and trailer said car to the aformentioned dealers. After a couple of days of checks they think ive cooked it, to explain lost oil, after they replaced pump and removed and replaced cambelt (when i put it on it was 1 tooth out on one cam pulley) and put hall effect sensor connector back on (fell off when i was working on it hence not starting when i tried) it started but wouldn't rev. So just wondering whether the garage has damaged the engine cos I cannot see being one tooth out or even 2 teeth out on timing causing valve or piston damage. Or whether their timing is out slightly etc causing the low compression as intake and exhaust valves aren't closed properly. I've racked my limited knowledge, my dads and the dealers are no wiser. So you experts out there can you shed any light on this matter, pretty please

 

Regards Keelan

 

 

 

Ps. Any more information required to help resolve this issue I will be glad to give.

Edited June 25, 2008 by kjgreen3
email shown (see edit history)

[Whitesupraboy2]

The engine is a none interferance engine. I jumped 4 teeth on my old supra...new belt on and away I drove.

 

Welcome by the way. I'll let someone else reply who's more technical although the technical guys dont check this section much if at all.

[gaz1]

welcome mate, this needs to go in tech;)

[kjgreen3]

Thanks for the welcome and the prompt reply, you have at least put my mind at ease about my timing belt change and no valve damage. I think the old belt might have jumped when it snagged the bolt and hence when I did the swap the old belt was out anyway, well thats what I like to think

[JustGav]

South yorkshire? CW perhaps?

 

Reading it though, if it is down on compression and the timing is correct now, then it could be a headgasket or ring issue.

 

Out of interest how did you do the timing, did you simply just lock everything up and then put the belt back on, or did you do a proper TDC lineup?

Edited June 25, 2008 by JustGav (see edit history)

[kjgreen3]

Ok Gaz1. Yeah well im a n00b but ive copied the original post into technical now under title 'Low Compression Problems'. Cheers for pointing me in the right direction and thanks again for the welcome. God I miss her it . It's true what they say, You dont realise what you have until she develops low compression problems and wont run sweet

[RedM]

I've moved this to Tech and deleted the Low Compression thread as well. I've also made a more tech-friendly title. As it's now in Tech can we please have no chit-chat.

 

KJ,

 

You might want to remove your email address from your first post. Wouldn't want any nefarious types picking it up. If you also want to put a more generic Intro thread in the new members section, please feel free.

[kjgreen3]

Locked everything up and did like for like swap but when I think about it I should have made doubley sure by cutting old belt in half (in situ) along its length so I could get half the new belt on, then cut old belt off complete. Ah well hindsight is a wonderful thing, but if its a non interference engine being a couple of teeth out should'nt have caused it any compression damage when I started it. Should it?

[kjgreen3]

Thank you Mr Moderator and have taken your advice and deleted my email

[d_d]

im confused, you had a leak on the water pump and you was taking the cam covers off?

So the situation at the moment is that its loosing oil?

And doesnt rev?

low compression?

[123tom123tom]

might sound out the blue but where abouts in south yorkshire are you?

[kjgreen3]

Hey d&d yeah have to take middle cam cover off to access the remaining bolts on the water pump, i didn't realise until taking the cover off that the cam tensioner assembly is attached to the water pump, so i stopped right there and proceeded to put everything back together and thats when i dropped the flipping bolt behind the crank case cover. Oh im based in sheffield 123tom but the dealers have my supra in scunthorpe at the mo, stuck with driving my dads 4.7 V8 Jeep cherokee at the moment and its an auto, must remember not to use my left foot on the brake again. Emergency stop anyone

 

Oh and yes the dealers say it doesn't rev above tickover and low compression across all 6 cylinders but especially number 6 cylinder, they are gonna do more tests tomorrow so ill post any new info that i find out then. Thanks for all your helpful hints and questions btw keep them coming

Edited June 25, 2008 by kjgreen3 (see edit history)

[kjgreen3]

Righto getting car back tomorrow. According to the dealer the crank sensor has fallen out of position but its fixed and now he says it runs well. So im gonna keep an eye on the oil level and see if it drives any different to how i had it before. But to be fair a dealer specialising in imports should have diagnosed this problem in less then 4 days but at least he only charged me 6 hours labour plus parts so I cant grumble. But £500 quid for a dropped bolt is an expensive mistake to make. Anyway will keep you all posted on what happens and thanks again to all the people who helped me out. Hopefully this will be the end of the whole fiasco lol.