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No Compression

SNSTR8

By SNSTR8,
in South Australia

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DSTROY Grand Master

DSTROY

Posted
Posted (edited)
hi all have just got myself an r33 , had a previous repair on the belt and after setting everything up according to all timing marks i have no compression on any cylinders , any help on fixing this issue will be appreciated

What happened to the last belt? If it was snapped while driving then the engine is probably a throw away.

Edited by DSTROY
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SLED Grand Master

SLED

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before you go removing the head, remove tappet covers and see if either any valves have stuck down (ie bent) or if any can be pulled out spring and all (ie broken valves)

Cant see all the valves in every cylinder kissing pistons therefore should have some pressure....you're clearly doing something wrong.

....and if a valve hits a piston, the whole motor is not necessarily a throw away.

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SNSTR8 Rookie

SNSTR8

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removing the head will be the last option , will be removing the tappet covers tomorrow to check out everything else . not much else you can do wrong if you set everything the way the factory says to ( ie using all of the timing marks etc ) even with no belt the motor still free spins with all the plugs in it

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SLED Grand Master

SLED

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Posted
removing the head will be the last option , will be removing the tappet covers tomorrow to check out everything else . not much else you can do wrong if you set everything the way the factory says to ( ie using all of the timing marks etc ) even with no belt the motor still free spins with all the plugs in it

you didn't did you?

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SNSTR8 Rookie

SNSTR8

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no i didnt , it seems that the previous owner has spent a lot of time trying to get this thing running again and has just told me that once they had fitted the timing belt and went to start the car it locked up ( now i know i have bigger issues ) and they went over it and reset everything numerous times with no good results ( including winding the motor with out the belt to see if they had any compression ) seems that i can move both cams with little or no force aswell

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SLED Grand Master

SLED

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clearly you guys don't know what you're doing so I suggest you see a mechanic.

First you said that it turns with no compression now you're saying that it locks up and in between you said that the motor spins freely without the belt which is an absolute NO NO to anyone that knows what they are doing....goodluck with it mate but it does look like you've got some troubles now that could've possibly been avoided if taken to a mechanic immediately

EDIT: Also, I don't see how you can turn the cams easily if the lobes are hard pressed against spring retainers.....unless of course certain valves are stuck open or broken now (which I'm guessing is quite likely).

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Carbon 34 Grand Master

Carbon 34

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Posted

sounds like you bent the valves which now won't close to create compression, by attempting to fix something with no clue

RB's are interference engines, throw a belt, bend a valve or break them off in most cases

open the oil filler cap, have someone spin the engine by hand, see if you can see the rockers/cams etc moving at all, before wasting time pulling the head

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